ignore-errors requires cl

vc-git complains that it can't find the definition of ignore-errors
unless I (require 'cl). So I guess the correct place to do that is in
the file itself.
Signed-off-by: NKarl Hasselström <kha@treskal.com>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

contrib/emacs/vc-git.el

@@ -33,6 +33,8 @@
 ;;  - working with revisions other than HEAD
 ;;
 
+(eval-when-compile (require 'cl))
+
 (defvar git-commits-coding-system 'utf-8
   "Default coding system for git commits.")