bug#14066: 24.3; vc-bzr-revert shouldn't create backup files

[Leo Liu]

According to vc-default-make-version-backups-p, no backup file is
created for the bzr backend. However 'bzr revert' itself creates backups
which is very confusing.

So I propose the following patch:

diff --git a/lisp/vc/vc-bzr.el b/lisp/vc/vc-bzr.el
index f436d300..c1195eee 100644
--- a/lisp/vc/vc-bzr.el
+++ b/lisp/vc/vc-bzr.el
@@ -644,7 +644,7 @@ (defun vc-bzr-checkout (_file &optional _editable rev)
 
 (defun vc-bzr-revert (file &optional contents-done)
   (unless contents-done
-    (with-temp-buffer (vc-bzr-command "revert" t 0 file))))
+    (with-temp-buffer (vc-bzr-command "revert" t 0 file "--no-backup"))))
 
 (defvar log-view-message-re)
 (defvar log-view-file-re)