Use svn_hash_gets/svn_hash_sets, part 1: #include "svn_hash.h" everywhere
that <apr_hash.h> is included.  I assume most of those use APR_HASH_KEY_STRING.

* subversion/bindings/swig/python/libsvn_swig_py/swigutil_py.c
* subversion/libsvn_client/commit.c
* subversion/libsvn_client/diff_local.c
* subversion/libsvn_client/import.c
* subversion/libsvn_delta/xdelta.c
* subversion/libsvn_fs/access.c
* subversion/libsvn_fs/fs-loader.c
* subversion/libsvn_fs_base/bdb/changes-table.c
* subversion/libsvn_fs_base/bdb/env.c
* subversion/libsvn_fs_fs/tree.c
* subversion/libsvn_ra/ra_loader.c
* subversion/libsvn_repos/delta.c
* subversion/libsvn_subr/dso.c
* subversion/libsvn_subr/properties.c
* subversion/libsvn_subr/sorts.c
* subversion/libsvn_wc/adm_crawler.c
* subversion/libsvn_wc/conflicts.c
* subversion/mod_dav_svn/deadprops.c
* subversion/mod_dav_svn/merge.c
* subversion/mod_dav_svn/mod_dav_svn.c
* subversion/mod_dav_svn/repos.c
* subversion/svn/props.c
* subversion/tests/libsvn_subr/mergeinfo-test.c
  (svn_hash.h): Add #include.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1460144 13f79535-47bb-0310-9956-ffa450edef68