[Bug bootstrap/66471] BITMAP is a reserved keyword on MinGW

[ismail at donmez dot ws]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66471

--- Comment #2 from İsmail Dönmez <ismail at donmez dot ws> ---
(In reply to Martin Liška from comment #1)
> Created attachment 35725 [details]
> Patch
> 
> May I ask you for testing the patch?

Fixes the bootstrap for me, thanks.