Post-branch housekeeping.  Having branched 1.8.x from trunk, increment the
trunk minor version number to 9.

* subversion/include/svn_version.h,
  subversion/tests/cmdline/svntest/main.py,
  build/run_tests.py
  (SVN_VER_MINOR): Bump to 9.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1467415 13f79535-47bb-0310-9956-ffa450edef68