backport.pl: Follow-up to r1507640: implement basename() really correctly (that is, don't).
backport.pl: Follow-up to r1507640: implement basename() really correctly
(that is, don't).

* tools/dist/backport.pl
  (File::Basename::basename): Import.
  (usage, handle_entry): Use it instead of reinventing it.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1507643 13f79535-47bb-0310-9956-ffa450edef68

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