Fix a crash in 'svnmucc --version' when extra arguments are given.

For example, 'svnmucc --version -q' crashed. For now, just ignore any extra
arguments. Ideally we should handle the 'version' and 'help' options more
like the way the other command-line programs do, validating all arguments
before executing the request.

* subversion/svnmucc/svnmucc.c
  (display_version): Don't pass an 'opt state' to the help function, as we
    have no corresponding command table to pass with it.
  (sub_main): Adjust the call.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1625496 13f79535-47bb-0310-9956-ffa450edef68