Fix release.py create-tag command to deal with version svn_version.h.dist files.

Follow up to r1464654 apparently missed this case.

* tools/dist/release.py:
  (create_tag): Add the version number to the source of the svn_version.h
    file name. 


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1479012 13f79535-47bb-0310-9956-ffa450edef68