On the authzperf branch: Simplify the prefix matching code.
The underlying data structure needs to be reworked and fixed.

* subversion/libsvn_repos/authz.c
  (SORTING_THRESHOLD): Remove.
  (add_prefix_matches): Remove linear lookup code.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/authzperf@1621355 13f79535-47bb-0310-9956-ffa450edef68