[Issue 21946] importC: Support parsing __extension__ keyword

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21946

Dlang Bot <dlang-bot at dlang.rocks> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull

--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@ibuclaw updated dlang/dmd pull request #12552 "fix Issue 21946, 21942: Remove
__asm and __asm__ tokens" fixing this issue:

- fix Issue 21946, 21942: Remove __asm and __asm__ tokens, add note about using
macro to remove or replace alternate keywords

https://github.com/dlang/dmd/pull/12552

--