[Cin] Updated x265 snapshot from another thread

[Phyllis Smith]

This was from another thread - mixed in with libaom 3.8 - so wanted it to
not get lost.

Initial test on the x265 snapshot of 17122023 succeeded, but I have a lot
more testing to do.  For some reason my initial test core-dumped but when I
ran it again, it worked so not sure why.  (I broke more things today, then
I fixed).
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