introduce c11_compat.h to provide C11 things in C99

Right now, all it does is provide the new standard `static_assert()` name.

Fixes: fbf7c38da35afe7f1de0 ("egl/wayland: use bitset.h for `formats` bit set")
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Tested-by: Bhushan Shah <bshah@kde.org>
2 files changed