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

libgloss/riscv/sys_link.c

@@ -0,0 +1,8 @@
+#include <machine/syscall.h>
+#include "internal_syscall.h"
+
+/* Establish a new name for an existing file.  */
+int _link(const char *old_name, const char *new_name)
+{
+  return syscall_errno (SYS_link, old_name, new_name, 0, 0, 0, 0);
+}