make: ship the Joyent patch to enable parallel make (originally from rm)

@@ -135,11 +135,11 @@
  *              parallel_process_cnt Do we need to wait for anything?
  *              report_pwd      Should we report the current path?
  */
 /*VARARGS*/
 void
-fatal(char * message, ...)
+fatal(const char *message, ...)
 {
         va_list args;
 
         va_start(args, message);
         (void) fflush(stdout);