build: fix make.rc on Plan 9

Set $status as null to prevent rc from exiting
on the last --no-banner argument checking when
used with rc -e. It allows all.rc to not exit
before executing run.rc

R=golang-dev, lucio.dere, rsc
CC=golang-dev
https://golang.org/cl/9611045

diff --git a/src/make.rc b/src/make.rc
index 83d16c04552dee8ff68a1198085e88a455c12cae..222bb8a186292d3432b5caee1ea0ed248d6cfb56 100755 (executable)
--- a/src/make.rc
+++ b/src/make.rc
@@ -95,3 +95,5 @@ rm -f $GOTOOLDIR/go_bootstrap
 
 if(! ~ $1 --no-banner)
        $GOTOOLDIR/dist banner
+
+status=''