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Add missing cast in read syscall

    We were passing an uninitialized length. oops.

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

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

@@ -391,7 +391,7 @@

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

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

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

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

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

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

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

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

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

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

@@ -437,7 +437,7 @@

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

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

 const creat	= {path, mode;		-> open(path, Ocreat | Otrunc | Owronly, mode)}

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

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

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

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

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