ext/ffmpeg-build now has a committed config.h in place of the configure checks.
Assembly and arch-specific code are off, as in the --disable-asm builds of the
old prebuilt libraries, so only the platform has to be told apart, with a few
preprocessor checks. The sources are listed once in sources.mk, for every build
system to use, and build one static library. ATRAC3 and ATRAC3+ are enabled to
match the prebuilt libraries, and HAVE_AV_CONFIG_H is now defined, as FFmpeg's
own build does.
CMake builds this unless USE_SYSTEM_FFMPEG or FFMPEG_DIR is set, and no longer
looks for the prebuilt libraries in ffmpeg/. MinGW now builds it too, instead
of falling back to the system's.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
