[PATCH][PR build/23568] Fix gdb-7.12.1 MinGW/MSYS build issue

[Tom Tromey]

>>>>> "Simon" == Simon Marchi <simon.marchi@polymtl.ca> writes:

>> And I know, the MinGW/MSYS original project is maintained but almost
>> deprecated in favour of MinGW-w64/MSYS2 project. But I really need XP
>> support for my needs.
>> I proposed this patch because it's really simple and not intrusive,
>> but you're right, how many people uses that old MinGW/MSYS project?

Simon> If the missing definition is indeed a mingw bug, but there is really
Simon> no way of getting a new mingw release with that fixed because the
Simon> project is unmaintained (but still useful to some people), I would not
Simon> be against a patch like what you proposed.  I would however add a
Simon> clear comment for why this is needed, so that if some day we
Simon> officially decide not to support this mingw, we can remove it.

Also, is there any downside to the original patch?
If not then I think we might as well accept it, subject to Simon's
request here.

Tom