bug#32375: Bug Gzip v1.9

[Paul Eggert]

Thanks for reporting the bug. Although I doubt whether it can occur on any 
practical platform, we should fix it even if it's just theoretical. I installed 
into gzip master on savannah the attached patch, which I hope fixes the problem; 
please give it a try.

The SYMBIOSYS tool did not discover a related theoretical bug with the 
'caught_signals' variable, which also is used inside a signal handler despite 
not being volatile, so you might want to look into that. The attached patch 
should fix this related bug too.

I am CC'ing this to Bdale Garbee, since much of this patch brings in a Gnulib 
replacement for sigaction that I expect nowadays is used only on mingw, and 
Bdale is my mingw guru (see Bug#32305).

0001-Fix-some-theoretical-races-in-signal-handling.patch
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