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

libgloss/riscv/sys_fstat.c

@@ -0,0 +1,15 @@
+#include <machine/syscall.h>
+#include "kernel_stat.h"
+#include "internal_syscall.h"
+
+/* Status of an open file. The sys/stat.h header file required is
+   distributed in the include subdirectory for this C library.  */
+
+int
+_fstat(int file, struct stat *st)
+{
+  struct kernel_stat kst;
+  int rv = syscall_errno (SYS_fstat, file, &kst, 0, 0, 0, 0);
+  _conv_stat (st, &kst);
+  return rv;
+}