On the fsfs-format7 branch: provide cache (de-)serializes for APR arrays
with "flat" elements, i.e. without pointers in them.

* subversion/libsvn_fs_fs/temp_serializer.h
  (svn_fs_fs__serialize_apr_array,
   svn_fs_fs__deserialize_apr_array): declare (de-)serialization functions

* subversion/libsvn_fs_fs/temp_serializer.c
  (svn_fs_fs__serialize_apr_array,
   svn_fs_fs__deserialize_apr_array): implement them


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1476615 13f79535-47bb-0310-9956-ffa450edef68