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Fix mmap offset on OpenBSD (see http://marc.info/?l=openbsd-tech&m=146793252011083&w=2)

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

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

@@ -633,7 +633,8 @@

 /* memory management */

 const munmap	= {addr, len;		-> syscall(Sysmunmap, a(addr), a(len))}

 const mmap	= {addr, len, prot, flags, fd, off;

-	-> (syscall(Sysmmap, a(addr), a(len), a(prot), a(flags), a(fd), a(off)) : byte#)

+	/* the actual syscall has padding on the offset arg */

+	-> (syscall(Sysmmap, a(addr), a(len), a(prot), a(flags), a(fd), a(0), a(off)) : byte#)

 }

 /* time */