[Bug build/29966] Cannot build anymore for win32 thread model of gdb

["jwakely.gcc at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29966

--- Comment #45 from Jonathan Wakely <jwakely.gcc at gmail dot com> ---
(In reply to Tom Tromey from comment #44)
> Yes, but the IIUC there is an additional fix in upstream libstdc++
> that is planned to be fixed.

No, I've decided against it, because it gets ugly, and I have better things to
do than try to fix systems that were already EOL when I last used Windows
myself (which is a *long* time ago).

Libstdc++ is just going to officially and explicitly say that prehistoric
versions of Windows are not supported when using the win32 thread model. Either
use the posix thread model (which makes use of winpthreads), or build for
non-prehistoric versions.

So that might mean that GDB needs to pick a newer default value of
_WIN32_WINNT, because the current "define it to 0x0501 if not defined already"
logic selects a prehistoric version which cannot be used with GCC 13 +
--enable-threads=win32

Sorry, but libstdc++ progress is not going to be held back by a tiny handful of
vocal users that aren't actually helping provide support for their dead
targets.

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