[Bug libstdc++/97362] [8/9/10 Regression] `__deref` in in debug mode clashes with internal macro in Windows system header

[frankhb1989 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97362

--- Comment #8 from frankhb1989 at gmail dot com ---
The first diagnostic message of `#pragma GCC poison __deref` points to <sal.h>
in my MSYS2 installation.

The change is made here:
https://sourceforge.net/p/mingw-w64/mingw-w64/ci/555bee806560144c6a59077f3c860bc83411153c/.