* Rewrite of the looprestoration (SGR, wiener) to reduce stack
usage
* Rewrite of {put,prep}_scaled functions
* Improvements on the SSSE3 SGR
* Improvements on ARM32/ARM64 looprestoration optimizations
* RISC-V: blend optimizations for high bitdepth
* Power9: blend optimizations for 8bpc
* Port RISC-V to POSIX/non-Linux OS
* AArch64: Add Neon implementation of load_tmvs
* Fix a rare, but possible deadlock, in flush()
OBS-URL: https://build.opensuse.org/package/show/multimedia:libs/dav1d?expand=0&rev=86
