o House a known good ffmpeg CVS snapshot under MASTER_SITE_LOCAL
o Add -lm to libs, some installations seem to explicitly require

it

PR: 43973
Prompted by: Joe "Floid" Kanowitz <jkanowitz@snet.net>
Reviewed by: Charles Henrich <henrich@sigbus.com>,

		Steve O'Hara-Smith <steve@sohara.org>,
		alex@acatysmoof.com