Unbreak make -s. There's about a 10% performance improvement with -s

in many environments.  The recent --- blah --- reintroduction has
killed.  That output makes almost no sense when all the other output
is silenced.

usr.bin/make/main.c

@@ -532,6 +532,7 @@ rearg:
 			MFLAGS_append("-r", NULL);
 			break;
 		case 's':
+			beQuiet = TRUE;
 			beSilent = TRUE;
 			MFLAGS_append("-s", NULL);
 			break;