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Add pread/pwrite syscalls.

--- a/lib/sys/sys+freebsd-x64.myr

+++ b/lib/sys/sys+freebsd-x64.myr

@@ -828,8 +828,10 @@

 	const creat	: (path:byte[:], mode:int64 -> fd)

 	const unlink	: (path:byte[:] -> int)

 	const read	: (fd:fd, buf:byte[:] -> size)

+	const pread	: (fd:fd, buf:byte[:] -> size)

 	const readv	: (fd:fd, iov:byte[:][:] -> size)

 	const write	: (fd:fd, buf:byte[:] -> size)

+	const pwrite	: (fd:fd, buf:byte[:] -> size)

 	const writev	: (fd:fd, iov : byte[:][:] -> size)

 	const lseek	: (fd:fd, off : off, whence : whence -> int64)

 	const stat	: (path:byte[:], sb:statbuf# -> int64)

@@ -959,8 +961,10 @@

 const creat	= {path, mode;		-> (openmode(path, Ocreat | Otrunc | Owronly, mode) : fd)}

 const unlink	= {path;		-> (syscall(Sysunlink, cstring(path)) : int)}

 const read	= {fd, buf;		-> (syscall(Sysread, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pread	= {fd, buf, off;	-> (syscall(Syspread, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const readv	= {fd, vec;		-> (syscall(Sysreadv, a(fd), (vec : byte[:]#), a(vec.len)) : size)}

 const write	= {fd, buf;		-> (syscall(Syswrite, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pwrite	= {fd, buf, off;	-> (syscall(Syspwrite, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const writev	= {fd, vec;		-> (syscall(Syswritev, a(fd), (vec : byte[:]#), a(vec.len)) : size)}

 const lseek	= {fd, off, whence;	-> syscall(Syslseek, a(fd), a(off), a(whence))}

 const stat	= {path, sb;		-> syscall(Sysstat, cstring(path), a(sb))}

--- a/lib/sys/sys+linux-x64.myr

+++ b/lib/sys/sys+linux-x64.myr

@@ -728,7 +728,9 @@

 	const creat	: (path:byte[:], mode:int64 -> fd)

 	const unlink	: (path:byte[:] -> int)

 	const read	: (fd:fd, buf:byte[:] -> size)

+	const pread	: (fd:fd, buf:byte[:], off : off -> size)

 	const write	: (fd:fd, buf:byte[:] -> size)

+	const pwrite	: (fd:fd, buf:byte[:], off : off -> size)

 	const lseek	: (fd:fd, off:off, whence:whence -> int64)

 	const stat	: (path:byte[:], sb:statbuf# -> int64)

 	const lstat	: (path:byte[:], sb:statbuf# -> int64)

@@ -856,7 +858,9 @@

 const rename	= {from, to;		-> syscall(Sysrename, cstring(from), cstring(to))}

 const unlink	= {path;		-> (syscall(Sysunlink, cstring(path)) : int)}

 const read	= {fd, buf;		-> (syscall(Sysread, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pread	= {fd, buf, off;	-> (syscall(Syspread64, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const write	= {fd, buf;		-> (syscall(Syswrite, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pwrite	= {fd, buf, off;	-> (syscall(Syspwrite64, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const lseek	= {fd, off, whence;	-> syscall(Syslseek, a(fd), a(off), a(whence))}

 const stat	= {path, sb;		-> syscall(Sysstat, cstring(path), a(sb))}

 const lstat	= {path, sb;		-> syscall(Syslstat, cstring(path), a(sb))}

--- a/lib/sys/sys+netbsd-x64.myr

+++ b/lib/sys/sys+netbsd-x64.myr

@@ -847,8 +847,10 @@

 	const creat	: (path:byte[:], mode:int64 -> fd)

 	const unlink	: (path:byte[:] -> int)

 	const read	: (fd:fd, buf:byte[:] -> size)

+	const pread	: (fd:fd, buf:byte[:], off : off -> size)

 	const readv	: (fd:fd, iov:byte[:][:] -> size)

 	const write	: (fd:fd, buf:byte[:] -> size)

+	const pwrite	: (fd:fd, buf:byte[:], off : off -> size)

 	const writev	: (fd:fd, iov : byte[:][:] -> size)

 	const lseek	: (fd:fd, off : off, whence : whence -> int64)

 	const stat	: (path:byte[:], sb:statbuf# -> int64)

@@ -977,8 +979,10 @@

 const creat	= {path, mode;		-> (openmode(path, Ocreat | Otrunc | Owronly, mode) : fd)}

 const unlink	= {path;		-> (syscall(Sysunlink, cstring(path)) : int)}

 const read	= {fd, buf;		-> (syscall(Sysread, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pread	= {fd, buf, off;	-> (syscall(Syspread, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const readv	= {fd, vec;		-> (syscall(Sysreadv, a(fd), (vec : byte[:]#), a(vec.len)) : size)}

 const write	= {fd, buf;		-> (syscall(Syswrite, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pwrite	= {fd, buf, off;	-> (syscall(Syspwrite, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const writev	= {fd, vec;		-> (syscall(Syswritev, a(fd), (vec : byte[:]#), a(vec.len)) : size)}

 const lseek	= {fd, off, whence;	-> syscall(Syslseek, a(fd), a(off), a(whence))}

 const stat	= {path, sb;		-> syscall(Sys__stat50, cstring(path), a(sb))}

--- a/lib/sys/sys+openbsd-x64.myr

+++ b/lib/sys/sys+openbsd-x64.myr

@@ -554,8 +554,10 @@

 	const creat	: (path:byte[:], mode:int64 -> fd)

 	const unlink	: (path:byte[:] -> int)

 	const read	: (fd:fd, buf:byte[:] -> size)

+	const pread	: (fd:fd, buf:byte[:], off : off -> size)

 	const readv	: (fd:fd, iov:byte[:][:] -> size)

 	const write	: (fd:fd, buf:byte[:] -> size)

+	const pwrite	: (fd:fd, buf:byte[:], off : off -> size)

 	const writev	: (fd:fd, iov : byte[:][:] -> size)

 	const lseek	: (fd:fd, off : off, whence : whence -> int64)

 	const stat	: (path:byte[:], sb:statbuf# -> int64)

@@ -680,8 +682,10 @@

 const creat	= {path, mode;		-> (openmode(path, Ocreat | Otrunc | Owronly, mode) : fd)}

 const unlink	= {path;		-> (syscall(Sysunlink, cstring(path)) : int)}

 const read	= {fd, buf;		-> (syscall(Sysread, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pread	= {fd, buf, off;	-> (syscall(Syspread, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const readv	= {fd, vec;		-> (syscall(Sysreadv, a(fd), (vec : byte[:]#), a(vec.len)) : size)}

 const write	= {fd, buf;		-> (syscall(Syswrite, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pwrite	= {fd, buf, off;	-> (syscall(Syspwrite, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const writev	= {fd, vec;		-> (syscall(Syswritev, a(fd), (vec : byte[:]#), a(vec.len)) : size)}

 const lseek	= {fd, off, whence;	-> syscall(Syslseek, a(fd), a(off), a(whence))}

 const stat	= {path, sb;		-> syscall(Sysstat, cstring(path), a(sb))}

--- a/lib/sys/sys+osx-x64.myr

+++ b/lib/sys/sys+osx-x64.myr

@@ -759,7 +759,9 @@

 	const creat	: (path:byte[:], mode:int64 -> fd)

 	const unlink	: (path:byte[:] -> int)

 	const read	: (fd:fd, buf:byte[:] -> size)

+	const pread	: (fd:fd, buf:byte[:], off : off -> size)

 	const write	: (fd:fd, buf:byte[:] -> size)

+	const pwrite	: (fd:fd, buf:byte[:], off : off -> size)

 	const lseek	: (fd:fd, off:off, whence:whence -> off)

 	const stat	: (path:byte[:], sb:statbuf# -> int64)

 	const lstat	: (path:byte[:], sb:statbuf# -> int64)

@@ -925,7 +927,9 @@

 const creat	= {path, mode;		-> (openmode(path, Ocreat | Otrunc | Owronly, mode) : fd)}

 const unlink	= {path;		-> (syscall(Sysunlink, cstring(path)) : int)}

 const read	= {fd, buf;		-> (syscall(Sysread, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pread	= {fd, buf, off;	-> (syscall(Syspread, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const write	= {fd, buf;		-> (syscall(Syswrite, a(fd), (buf : byte#), a(buf.len)) : size)}

+const pwrite	= {fd, buf, off;	-> (syscall(Syspwrite, a(fd), (buf : byte#), a(buf.len), a(off)) : size)}

 const lseek	= {fd, off, whence;	-> __osx_lseek(fd, off, whence)}

 const stat	= {path, sb;		-> syscall(Sysstat64, cstring(path), a(sb))}

 const lstat	= {path, sb;		-> syscall(Syslstat64, cstring(path), a(sb))}