Master: Resolve Stdio.FILE at a well-defined time.

Fixes various issues triggered when Stdio was first resolved from
master()->locale_werror(). One such issue was "Got placeholder object
when indexing module String with 'SplitIterator'. (Resolver problem.)"
when compiling lib/modules/Stdio.pmod/module.pmod.

lib/master.pike.in

@@ -4352,6 +4352,7 @@ void _main(array(string(0..255)) orig_argv)
 	exit(0);
   }
 
+  main_resolv( "Stdio.FILE" );
   main_resolv( "Gmp.bignum" );
 
   if(sizeof(argv)==1)