On the authzperf branch: Avoid double definition of svn_authz_t.

* subversion/libsvn_repos/repos.h
  (svn_authz_t): Define here.
* subversion/libsvn_repos/authz.c, subversion/libsvn_repos/authz_pool.c
  (svn_authz_t): Remove definitions.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/authzperf@1613422 13f79535-47bb-0310-9956-ffa450edef68