making it unambiguous again

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@23491 71c3de6d-444a-0410-be80-ed276b4c234a

rc.sh

@@ -27,7 +27,7 @@
 #
 
 # there shouldn't be any unmerged changes in the RC branch
-svnmerge merge -S rc .
+svnmerge merge -S /branches/rc .
 pending=$(svn status | grep -v '^?' | wc -l)
 if [ $pending != 0 ]; then
   echo "unmerged or uncommitted changes"