In the Windows test runner: automatically copy additional apr dlls
(such as the apr-util crypto dll).

* win-tests.py
  (locate_libs): When a dependency has additional binaries, copy these too.
  
* build/generator/gen_win_dependencies.py
  (_find_apr,
   _find_apr_util_and_expat): Find additional binaries and provide information
     on them.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1539300 13f79535-47bb-0310-9956-ffa450edef68