On the fsfs-format7 branch:  Fix a deprecation warning in FSX.

* subversion/libsvn_fs_x/fs.c
  (svn_fs_x__init): upgrade to using svn_ver_check_list2

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-format7@1507266 13f79535-47bb-0310-9956-ffa450edef68