5l: make -v option output less nonessential clutter

        5l -v is for benchmarking various parts of the loader, but this code in
        obj.c will clutter the output. I only comment them out, because this is
        on par with 8l/6l.

R=golang-dev
CC=golang-dev
https://golang.org/cl/5600046

src/cmd/5l/obj.c

@@ -558,8 +558,8 @@ loop:
 		// redefinitions.
 		s = p->from.sym;
 		if(s->dupok) {
-			if(debug['v'])
-				Bprint(&bso, "skipping %s in %s: dupok\n", s->name, pn);
+//			if(debug['v'])
+//				Bprint(&bso, "skipping %s in %s: dupok\n", s->name, pn);
 			goto loop;
 		}
 		if(s->file == nil)