o Make it CFLAGS safe (I have no idea how this escaped me)
o Unless WITHOUT_LIBA52, use liba52 port instead of ffmpeg liba52
code. The liba52 port is more optimized.
o Use FreeBSD byteswap optimized routines IF one happens to be using
either FreeBSD 4.7-RELEASE or later
o Do not bump PORTREVISION
Submitted by: "Steve O'Hara-Smith" <steve@sohara.org> [1]
Reviewed by: "Steve O'Hara-Smith" <steve@sohara.org>