siv e4e9c0fd drops AVIF, and with it libavif, dav1d, and the NASM build. The stripped release binary goes from 13,071,792 to 11,090,840 bytes. dav1d was also the one place AVX-512 was allowed in the release, as assembly it chose only on a CPU that had it. Without it no code may use AVX-512, so the release check counts every such instruction.