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[ar] Print usage on mutually exclusive options

--- a/src/cmd/ar.c

+++ b/src/cmd/ar.c

@@ -617,7 +617,10 @@

 		usage();

 	} ARGEND

-	if (nkey == 0 || nkey > 1 || pos > 1 || argc == 0)

+	if (nkey == 0 || nkey > 1 || pos > 1 || argc == 0 ||

+	    (aflag || bflag) && !(key == 'm' || key == 'r') ||

+	    cflag && !(key == 'q' || key == 'r') ||

+	    uflag && key != 'r')

 		usage();

 	signal(SIGINT, sigfun);