build: use stack alignment CC flags only on x86
Fix flush if n_input_frames < n_frame_threads.
Fix duplicate frame thread pointer freeing on close
arm: document arm asm rules
Add the word agree to contributor agreement.
Readme: Use release build type
Readme: Add missing build step
Fix macOS build
Add & use a thread compatibility layer
Initial decoder implementation.
Add buildsystem skeleton
Initial commit for dav1d