*l/*c: add -V flag to display version number

R=rsc
CC=golang-dev
https://golang.org/cl/204044
diff --git a/src/cmd/6l/obj.c b/src/cmd/6l/obj.c
index 537ef9e..d951696 100644
--- a/src/cmd/6l/obj.c
+++ b/src/cmd/6l/obj.c
@@ -136,6 +136,9 @@
 		if(argv[1] != nil && argv[1][0] != '-' && !isobjfile(argv[1]))
 			readundefs(ARGF(), SIMPORT);
 		break;
+	case 'V':
+		print("%cl version %s\n", thechar, getgoversion());
+		errorexit();
 	} ARGEND
 
 	if(argc != 1)