Defines the `static_assert` macro in `assert.h` as required by the C11 standard. Change-Id: Ic25dc99537f995404b7b4280b72c6000a293a1df Reviewed-on: https://review.haiku-os.org/c/haiku/+/6916 Reviewed-by: waddlesplash <[email protected]> Tested-by: Commit checker robot <[email protected]> Reviewed-by: Niels Sascha Reedijk <[email protected]>