To make it easier to diagnose some possible remaining performance problems
compare in most cases equal but potentially relative paths first before
making them absolute and comparing again.

This avoids translating between character encodings, several transformations,
and in some cases potentially IO.

* subversion/mod_dav_svn/repos.c
  (copy_resource): Perform an initial string comparison before making the
    paths absolute, canonical, etc.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1537440 13f79535-47bb-0310-9956-ffa450edef68