bug#16028: 24.3.50; Latest build completely breaks my thumnail frames code

[martin rudalics]

> I'd say that variable should be t by default.  Otherwise, we will
> never know if it does any trouble until it's too late.

Let's first see whether it helps at all.  What I did was to emulate
something like "Drew could you try this patch for w32term.c?".

martin