Bump tool versions for 1.8.x and trunk to the current stable versions.

* tools/dist/release.py:
  (tool_versions): For trunk and 1.8 bump autoconf to 2.69, libtool to 2.4.2,
    and swig to 2.0.9.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1478948 13f79535-47bb-0310-9956-ffa450edef68