Follow up to r1667990, make the copyright year check more complete and a bit faster.
Follow up to r1667990, make the copyright year check more
complete and a bit faster.

* tools/dist/release.py
  (_current_year, _copyright_re): New.
  (check_copyright_year):
   Search the whole file contents in one go; no need to split it
   into separate lines first. Look at subversion/libsvn_subr/version.c
   as well as the NOTICE file.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1668052 13f79535-47bb-0310-9956-ffa450edef68

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