[PATCH] Allow DVC to compile with XEmacsen

Did not attempt to run yet, but at least this makes it compile...

Summary of changes:

* condition-case (require 'dired-x) ignoring errors

* Only add uniquify-list-buffers-directory-modes to dvc-status-mode if
it is bound.

* Transform all ecase instances with 't' conditional to case, since
ecase does not support otherwise clauses, despite the fact the GNU Emacs
seems to violate Common Lisp there.

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