libx264: update to git HEAD of 2025-09-10

libx264: update to git HEAD of 2025-09-10

Changes since 2024-05-13:
 c24e06c2 configure: Check for SVE support in MS armasm64 via as_check
 3a8b5be2 aarch64: Use elf_aux_info() for CPU feature detection on FreeBSD/OpenBSD
 1243d9ff Provide x264_getauxval() wrapper for getauxvaul() and elf_aux_info()
 80c1c47c configure: Add DragonFly support
 3a21e97b Fix build with Android NDK and API < 24 for 32-bit targets
 b1d2de88 Use getauxval() on Linux and elf_aux_info() on FreeBSD/OpenBSD on arm/ppc
 da14df55 Make use of sysconf(3) _SC_NPROCESSORS_ONLN and _SC_NPROCESSORS_CONF
 023112c6 aarch64: defines involving bit shifts should be unsigned
 938601b9 Use sysctlbyname(3) hw.logicalcpu on macOS
 a64111b1 Enable use of __sync_fetch_and_add() wherever detected instead of just X86
 450946f9 ci: Test compiling for Android
 52f7694d Use sched_getaffinity on Android
 373697b4 Bump dates to 2025
 c80f8a28 msvsdepend: Allow using the script for .S sources too
 27d83708 Makefile: Generate dependency information implicitly while compiling
 a0191bd8 configure: Use as_check for checking for aarch64 features
 72ce1cde configure: Use as_check for the main check for whether NEON is supported
 f87ca183 configure: Check for .arch and .arch_extension for enabling aarch64 extensions
 87044b21 aarch64: Use configure detected directives for enabling SVE/SVE2
 fc4012fb configure: Check for the dotprod and i8mm aarch64 extensions
 0e48d072 aarch64: Add flags for runtime detection of dotprod and i8mm
 570f6c70 aarch64: Add runtime detection of extensions on Windows and macOS
 fe9e4a7f Provide implementations for functions using the instructions SDOT/UDOT in the DotProd Armv8 extension.
 32c3b801 lavf: Update the code to work with the latest libavutil API
 4360ac37 ci: Fix ffmpeg build
 40617ddb ci: Remove vlc-contrib dependency
 85b5ccea Update gas-preprocessor.pl to the latest upstream version
 ff620d0c configure: Use MSYSTEM_CARCH for default arch on msys2
 714e07b4 arm: Don't test x264_cpu_fast_neon_mrc_test on Windows
 291476d7 windows: Fix named pipes detection
 b35605ac i8mm & neon hpel_filter optimization
 0480cb05 riscv64: add compile support

Signed-off-by: Daniel Golle <redacted>