Enable the ability to build 1.9.x releases.

* tools/dist/release.py
  (tool_versions): Add 1.9 section, bump swig to 2.0.11 for trunk.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1545765 13f79535-47bb-0310-9956-ffa450edef68