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Use a correct implementation of pipe()

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

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

@@ -669,7 +669,7 @@

 const getdents	= {fd, buf;		-> syscall(Sysgetdents, a(buf), a(buf.len)) castto(int64)}

 /* file stuff */

-const pipe	= {fds;	-> __freebsd_pipe(fds)}

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

 const dup 	= {fd;	-> syscall(Sysdup, a(fd)) castto(fd)}

 const dup2 	= {src, dst;	-> syscall(Sysdup2, a(src), a(dst)) castto(fd)}

 const fcntl	= {fd, cmd, args; 	-> syscall(Sysfcntl, a(fd), a(cmd), a(args))}

--- a/lib/sys/syscall+freebsd-x64.s

+++ b/lib/sys/syscall+freebsd-x64.s

@@ -22,22 +22,3 @@

 .success:

 	ret

-

-/*

- * pipe() syscall returns the pipes created in eax:edx, and

- * needs to copy them to the destination locations manually.

- */

-.globl sys$__freebsd_pipe

-sys$__freebsd_pipe:

-	movq $0x2a,%rax

-	syscall

-

-	jae .pipesuccess

-	negq %rax

-

-.pipesuccess:

-	movl %eax,(%rdi)

-	movl %edx,4(%rdi)

-	xorq %rax,%rax

-	ret

-