Fix bug with set-time-zone-rule and LOCALTIME_CACHE.

* editfns.c (set_time_zone_rule) [LOCALTIME_CACHE]:
Clear tzvalbuf_in_environ if this workaround is in effect.
Problem and fix reported by Kazuhiro Ito.
Remove obsolete comment about NON_SAVING_SETJMP.
* lisp/vc/vc-bzr.el (vc-bzr--sanitize-header): New function.
(vc-bzr-checkin): Use it.
* lisp/vc/log-edit.el (log-edit-extract-headers): Don't presume FUNCTION
will preserve match-data.
* lisp/autorevert.el: Use cl-lib instead of cl.
Enable conservative stack scanning for all architectures.

Suggested by Stefan Monnier in
<http://lists.gnu.org/archive/html/emacs-devel/2013-01/msg00183.html>.
* configure.ac (GC_MARK_STACK): Remove.
* indent.c (Fvertical_motion): Remove now-incorrect GCPROs

for old_charpos and old_bytepos.
Auto-commit of generated files.