Update to x265-3.5 broke many multimedia tools

From: Kevin Oberman <rkoberman_at_gmail.com>
Date: Sat, 16 Dec 2023 17:00:43 UTC
Yesterday x265 was updated to 3.26 which included a major version change to
libavcodec. As a result, ports that use libavcodec are broken. At a
minimum, fmpeg, libheif and the avidemux ports all need to have
PORTREVISION bumped.

I have not checked on other ports which depend on x265, but I have probably
missed a few. Ports using ffmpeg and libheif do not need the bump. after
reinstalling ffmpeg and libheif, thongs like mpv ae once again working
normally.
-- 
Kevin Oberman, Part time kid herder and retired Network Engineer
E-mail: rkoberman@gmail.com
PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683