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Cast 'fd' to appropriate sized type.

    We have uninitialized crap in the syscall args otherwise.

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

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

@@ -592,13 +592,13 @@

 /* file manipulation */

 const open	= {path, opts;		-> syscall(Sysopen, cstring(path), opts, 0o777) castto(fd)}

 const openmode	= {path, opts, mode;	-> syscall(Sysopen, cstring(path), opts, mode) castto(fd)}

-const close	= {fd;			-> syscall(Sysclose, fd)}

+const close	= {fd;			-> syscall(Sysclose, fd castto(uint64))}

 const creat	= {path, mode;		-> syscall(Syscreat, cstring(path), mode) castto(fd)}

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

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

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

+const read	= {fd, buf;		-> syscall(Sysread, fd castto(uint64), buf castto(byte#), buf.len castto(size)) castto(size)}

+const write	= {fd, buf;		-> syscall(Syswrite, fd castto(uint64), buf castto(byte#), buf.len castto(size)) castto(size)}

+const lseek	= {fd, off, whence;	-> syscall(Syslseek, fd castto(uint64), off, whence)}

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

-const fstat	= {fd, sb;		-> syscall(Sysfstat, fd, sb)}

+const fstat	= {fd, sb;		-> syscall(Sysfstat, fd castto(uint64), sb)}

 const mkdir	= {path, mode;		-> syscall(Sysmkdir, cstring(path), mode) castto(int64)}

 const ioctl	= {fd, req, args

 	var arg : byte#

@@ -606,9 +606,9 @@

 	ap = vastart(&args)

 	(arg, ap) = vanext(ap)

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

+	-> syscall(Sysioctl, fd castto(uint64), req, arg) castto(int64)

 }

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

+const getdents64	= {fd, buf;	-> syscall(Sysgetdents64, fd castto(uint64), buf castto(byte#), buf.len)}

 /* file stuff */

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

@@ -624,7 +624,7 @@

 /* memory mapping */

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

-const mmap	= {addr, len, prot, flags, fd, off;	-> syscall(Sysmmap, addr, len, prot, flags, fd, off) castto(byte#)}

+const mmap	= {addr, len, prot, flags, fd, off;	-> syscall(Sysmmap, addr, len, prot, flags, fd castto(uint64), off) castto(byte#)}

 /* time */

 const clock_getres = {clk, ts;	-> syscall(Sysclock_getres, clockid(clk), ts) castto(int32)}