[Bug bootstrap/90543] Build failure on MINGW for gcc-9.1.0

[baue.flor.dev at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90543

--- Comment #3 from Florian Bauer <baue.flor.dev at gmail dot com> ---
(In reply to Martin Liška from comment #2)
> Patch has been sent:
> https://gcc.gnu.org/ml/gcc-patches/2019-05/msg01460.html

Thank you!