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Add fallocate for linux-x64

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

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

@@ -33,6 +33,8 @@

 	type signo	= int32

 	type sigflags	= int64

+	type fallocmode	= uint32

+

 	type clock = union

 		`Clockrealtime

 		`Clockmonotonic

@@ -423,6 +425,14 @@

 	const Sigio	: signo = 29

 	const Sigpoll	: signo = Sigio

+	/* fallocate mode */

+	const Fallockeepsize		: fallocmode = 0x01

+	const Fallocpunchhole		: fallocmode = 0x02

+	const Fallocnohidestale		: fallocmode = 0x04

+	const Falloccollapserange	: fallocmode = 0x08

+	const Falloczerorange		: fallocmode = 0x10

+	const Fallocinsertrange		: fallocmode = 0x20

+

 	/* syscalls */

 	const Sysread			: scno = 0

 	const Syswrite			: scno = 1

@@ -806,6 +816,7 @@

 	const getcwd	: (buf : byte[:] -> int64)

 	const sendmsg	: (fd:fd, msg:msghdr#, flags:msgflags -> int64)

 	const recvmsg	: (fd:fd, msg:msghdr#, flags:msgflags -> int64)

+	const fallocate : (fd:fd, mode:fallocmode, off:off, len:off -> int64)

 	/* signals */

 	const sigaction	: (sig : signo, act : sigaction#, oact : sigaction# -> int)

@@ -938,6 +949,7 @@

 const getcwd	= {buf;	-> syscall(Sysgetcwd, a(buf), a(buf.len))}

 const sendmsg	= {fd, msg, flags;	-> syscall(Syssendmsg, a(fd), msg, a(flags))}

 const recvmsg	= {fd, msg, flags;	-> syscall(Sysrecvmsg, a(fd), msg, a(flags))}

+const fallocate	= {fd, mode, off, len;	-> syscall(Sysfallocate, a(fd), a(mode),  a(off), a(len))}

 /* file stuff */

 const pipe	= {fds;	-> syscall(Syspipe, a(fds))}