On the 1.7.x-r1507044 branch, backport r1507044 from trunk, with the
following changes:

* subversion/bindings/swig/perl/libsvn_swig_perl/swigutil_pl.c:
  Use ye olde apr_hash_set instead of svn_hash_sets.
  Resolve whitepace conflicts.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.7.x-r1507044@1507301 13f79535-47bb-0310-9956-ffa450edef68