[C pkgs] Adapt tramp-vc to new vc

Ville Skyttä <scop(a)xemacs.org&gt; writes: >> (fboundp 'process-file) is a check for "GNU Emacs 22 existence", because >> it is a new function introduced there. Implicitely, it means "new vc >> existence". If there is a better check for the existence of "new vc", we >> should apply that instead. > > I think checking (fboundp 'vc-find-version) would be better. It exists > in the XEmacs "new vc" as well as in the one in GNU Emacs 22, but does > not exist in the XEmacs "old vc" nor in the GNU Emacs 21.3 one: > http://cvs.savannah.gnu.org/viewvc/emacs/lisp/vc.el?root=emacs&view=d... >r1=1.311.4.9%3AEMACS_21_3&tr1=1.311.4.9&r2=1.424%3AEMACS_22_1&tr2=1.1&diff >_format=h > > Patch attached. Looks OK to me. If you install it in Tramp's XEmacs package repository (maybe a little bit more commentary), I'll be happy to apply it to upstream Tramp as well.