multimedia/x265: update 4.2 -> 4.3

Upstream changes:

  * New: LoongArch64 support; foveated encoding (--fovea-gaze,
    --fovea-delta, --fovea-sigma, --fovea-gaze-file), which spends
    fewer bits away from a gaze point; selective, noise-based MCSTF
    (--selective-mcstf, --mcstf-ref-range).
  * MCSTF reworked: multi-threaded motion estimation and bilateral
    filtering, AVX2 kernels (about 2x faster with threading).
  * More AArch64 Neon/SVE/SVE2 optimizations; early-exit diamond
    search in threaded ME.
  * Fixes for ASAN/UBSAN and TSAN findings, threaded-ME and MCSTF
    crashes, --pools thread counts, scenecut with --bframes 0, a
    bitstream error with VUI timing info disabled, and CPU-feature
    detection on FreeBSD (elf_aux_info).
  * API: the temporalFilterStrength and searchRangeForLayer[012]
    fields are gone from x265_param; X265_BUILD is now 217.

https://github.com/Multicorewareinc/x265/blob/4.3/doc/reST/releasenotes.rst

The project has moved to GitHub; distfiles are now published as
release assets there.

While here, pull in the fixes committed upstream since 4.3: a crash
when x265 is run without arguments, uninitialized DTS fields,
out-of-range mvd values in the bitstream, a motion-search offset
error for small rectangular PUs, recon-file bit-depth handling in
multi-lib builds, repeated x265_encoder_headers() calls accumulating
NALs, stack underflows in the AArch64 and RISC-V intra filters, an
AArch64 execute-only fix, __atomic builtins (fixing 32-bit builds),
and removal of a 25% AArch64 slowdown caused by a mutex added in 4.3.

The version string now counts these on top of the release and names
the newest of them: 4.3+14-d978725.

Also make x265_param_free() accept NULL. With SVT-HEVC enabled, every
CLI error exit crashed: the CLI frees its parameters, clears the
pointer, and then hands the NULL to x265_param_free() a second time.

And build the 10- and 12-bit libraries with the same VMAF setting as
the main one. ENABLE_LIBVMAF changes the layout of x265_api, so with
the VMAF option on, encoding at those depths with --csv called through
a NULL pointer and crashed.

PR:		299194
Co-Authored-By: Claude Opus 5.5 <effort=high>

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