RISC-V: Moved syscalls to separate files to fix aliasing problems.

libgloss/riscv/sys_faccessat.c

@@ -0,0 +1,8 @@
+#include <machine/syscall.h>
+#include "internal_syscall.h"
+
+/* Permissions of a file (by name) in a given directory.  */
+int _faccessat(int dirfd, const char *file, int mode, int flags)
+{
+  return syscall_errno (SYS_faccessat, dirfd, file, mode, flags, 0, 0);
+}