Bump Libav to v9.2.

Miscellaneous fixes.

Also reduces the amount of patched code a bit.



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5272 b64f7644-9d1e-0410-96f1-a4d463321fa5
Bump x264 to r2273-b3065e6.

Miscellaneous bugfixes and improvements.



git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5273 b64f7644-9d1e-0410-96f1-a4d463321fa5