Make the perl bindings test skip the gnome-keyring test if gnome-keyring has not been compiled in.
Make the perl bindings test skip the gnome-keyring test if gnome-keyring
has not been compiled in.

* subversion/bindings/swig/perl/native/t/3client.t
  (gnome-kerying test): Skip if auth_set_gnome_keyring_unlock_prompt_func
   is not available.

With help from danielsh.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion