Enable 'svn cat --ignore-keywords'.

* subversion/svn/svn.c
  (svn_cl__cmd_table): Add option.

* subversion/svn/cat-cmd.c
  (svn_cl__cat): Update to non-deprecated function and pass option.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1547517 13f79535-47bb-0310-9956-ffa450edef68