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Add chdir() syscall.

--- a/libstd/sys-linux.myr

+++ b/libstd/sys-linux.myr

@@ -567,6 +567,7 @@

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

 	const ioctl	: (fd:fd, req : int64, args:... -> int64)

 	const getdents64	: (fd:fd, buf : byte[:] -> int64)

+	const chdir	: (p : byte[:] -> int64)

 	/* fd stuff */

 	const pipe	: (fds : fd[:] -> int64)

@@ -688,6 +689,7 @@

 	-> syscall(Sysioctl, a(fd), a(req), a(arg)) castto(int64)

 }

 const getdents64	= {fd, buf;	-> syscall(Sysgetdents64, a(fd), buf castto(byte#), a(buf.len))}

+const chdir	= {dir;	-> syscall(Syschdir, dir)}

 /* file stuff */

 const pipe	= {fds;	-> syscall(Syspipe, fds castto(fd#))}

--- a/libstd/sys-osx.myr

+++ b/libstd/sys-osx.myr

@@ -577,6 +577,7 @@

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

 	const ioctl	: (fd:fd, req : int64, args:... -> int64)

 	const getdirentries64	: (fd : fd, buf : byte[:], basep : int64# -> int64)

+	const chdir	: (p : byte[:] -> int64)

 	/* fd stuff */

 	const pipe	: (fd : fd[:] -> int64)

@@ -714,6 +715,7 @@

 	-> syscall(Sysioctl, a(fd), a(req), a(arg)) castto(int64)

 }

 const getdirentries64	= {fd, buf, basep;	-> syscall(Sysgetdirentries64, a(fd), buf castto(byte#), a(buf.len), a(basep))}

+const chdir	= {dir;	-> syscall(Syschdir, dir)}

 /* fd stuff */

 const pipe	= {fd;	-> __osx_pipe(fd castto(fd#))}