bug#75924: maint: fix s390 buffer flushes

[Paul Eggert]

Thanks for the bug report. I installed the attached, a bit simpler than 
the patch you suggested; can you please give it a try?

Also, is there a related bug near dfltcc.c line 375? That is, when 
(inptr == insize && fill_inbuf (1) == EOF && param->cf), won't insize 
then be zero, so that gzip will go into an infinite loop attempting to 
read past EOF?

0001-gzip-fix-problem-with-s390-buffer-flushes.patch
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