Mozilla upgrades:
- Update nspr to 4.10.7
- Update ca_root_nss to 3.17 (mark as NO_ARCH while here)
- Update firefox to 32.0
- Update thunderbird to 31.1.0
- Add net-im/linux-instantbird
- Update firefox-est to 31.1.0
- Update libxul to 24.8.0
- Update seamonkey to 2.29

Submitted by:	Jan Beich for gecko@


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@367712 35697150-7ecd-e111-bb59-0022644237b5
- Ensure internal libavcodec builds correct architecture-dependent code
- Introduce OPTION to use external ffmpeg instead of its own
- Bump PORTREVISION

PR:		181519, 181964
Submitted by:	jbeich@vfemail.net


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@367713 35697150-7ecd-e111-bb59-0022644237b5