backport.pl: Follow-up to r1567523.
backport.pl: Follow-up to r1567523.

* tools/dist/backport.pl
  (merge): Relax teh indentation pattern here, too.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1567563 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion