[Cin] Updated x265 snapshot from another thread

[Andrea paz]

I tried compiling with only the x265 new patch and everything works.
Applying the patch gave this result:

$ patch -p2 < 0010-Update-x265-to-git-snapshot-17122023.patch
patching file blds/termux.bld
Hunk #1 FAILED at 1.
1 out of 1 hunk FAILED -- saving rejects to file blds/termux.bld.rej
patching file configure.ac
patching file thirdparty/Makefile

I don't know if it is important.

Test renderings, using x265, work fine, except using the 10-bit and
12-bit presets fail indicating that those pixel formats are not
supported by x265 encoder.
Using the multibit appimage (without the new patch), the 12- and
10-bit renderings work, but the vaapi preset does not.
My results are:

55 fps <== Multibit <-- preset: x265-hi --> new patch ==> 71 fps

45 fps <== Multibit <-- preset x265 10-bit --> new patch ==> NO

NO <== Multibit <-- preset: hevc_vaapi --> new patch ==> 62 fps

I wonder if the separation between multibit and non-multibit versions
is still necessary.