Merge commit 'eb34d40354e2474517c9b9bd787e0dadc89c2a81'

* commit 'eb34d40354e2474517c9b9bd787e0dadc89c2a81':
  Add a compat dummy stdatomic.h used when threading is disabled
  Add a compat stdatomic.h implementation based on pthreads
  Add a compat stdatomic.h implementation based on suncc atomics
  Add a compat stdatomic.h implementation based on windows atomics
  Add a compat stdatomic.h implementation based on GCC atomics

This merge is a noop, see:
  41e891e89e Add a compat dummy stdatomic.h used when threading is disabled
  74b5f10862 Add a compat stdatomic.h implementation based on pthreads
  70faadc826 Add a compat stdatomic.h implementation based on suncc atomics
  c91e72ed52 Add a compat stdatomic.h implementation based on windows atomics
  3359eede8f Add a compat stdatomic.h implementation based on GCC atomics

Merged-by: Clément Bœsch <u@pkh.me>