Update to firefox 18.0 :

- see http://www.mozilla.org/en-US/firefox/18.0/releasenotes/
- fixes MFSA 2013-14 -> 20
- build with clang on i386/amd64 and with gcc 4.6 on powerpc. Required
  since upstream dropped support for gcc < 4.4.
- don't build against systemwide jpeg anymore since it now needs its
  internal libjpeg-turbo.
- add a stub method to sydney_audio_sndio.c in post-patch. Cant add it
  to the file in cvs directly otherwise it breaks other mozillas
- remove patch-ipc_chromium_src_base_atomicops_h, not needed anymore
ok sthen@

Written by: Landry Breuil <landry@openbsd.org>

Conflicts:
	www/mozilla-firefox/patches/patch-js_src_configure_in
	www/mozilla-firefox/patches/patch-toolkit_library_Makefile_in
Fix external plugin spawning (bug #830303), reported by nigel@.

Written by: Landry Breuil <landry@openbsd.org>
Bugfix update to firefox 18.0.1.

http://www.mozilla.org/en-US/firefox/18.0.1/releasenotes/

Written by: Landry Breuil <landry@openbsd.org>