Prefer setq-local in vc/*.el

Prefer setq-local in vc/*.el

* lisp/vc/add-log.el (find-change-log, change-log-mode):
* lisp/vc/cvs-status.el (cvs-status-mode):
* lisp/vc/diff-mode.el (diff-restrict-view, diff-find-file-name):
(diff-mode, diff-setup-whitespace, diff-apply-hunk):
* lisp/vc/diff.el (diff-no-select):
* lisp/vc/ediff-util.el (ediff-setup):
* lisp/vc/log-edit.el (log-edit, log-edit-mode):
* lisp/vc/log-view.el (log-view-mode):
* lisp/vc/pcvs.el (cvs-temp-buffer, cvs-make-cvs-buffer):
(cvs-update-filter, cvs-mode, cvs-mode-commit)
(cvs-mode-edit-log, cvs-vc-command-advice):
* lisp/vc/smerge-mode.el (smerge-match-conflict):
(smerge-ediff, smerge-mode):
* lisp/vc/vc-annotate.el (vc-annotate-mode):
(vc-annotate, vc-annotate-display):
* lisp/vc/vc-bzr.el (vc-bzr-log-view-mode):
* lisp/vc/vc-dir.el (vc-dir-mode):
* lisp/vc/vc-dispatcher.el (vc-setup-buffer):
(vc-compilation-mode, vc-start-logentry):
* lisp/vc/vc-git.el (vc-git-log-view-mode):
* lisp/vc/vc-hg.el (vc-hg-log-view-mode):
* lisp/vc/vc-hooks.el (vc-refresh-state):
* lisp/vc/vc-mtn.el (vc-mtn-log-view-mode):
* lisp/vc/vc-svn.el (vc-svn-log-view-mode):
* lisp/vc/vc.el (vc-register, vc-diff-internal):
(vc-find-revision-save, vc-find-revision-no-save):
(vc-log-internal-common, vc-region-history): Prefer setq-local.