[Bug-readline] readline not compiling on MinGW because of missing #ifdefs for SIGHUP and SIGQUIT

[Simon Sobisch]

I'd rather like to see a MinGW build for the GnuCOBOL 2.0 release than a
VisualStudio build just "because it compiles directly and the MinGW
build does not". And this is exactly what is happening with the people
testing our release candidate.

readline doesn't compile because of the SIGNALs SIGHUP and SIGQUIT that
are missing in windows (and therefore in the mingw headers, too).

Looking at Readline 6.3 there are at least signals.c (missing #ifdef
SIGHUP, already has #ifdef SIGQUIT) and input.c (missing both) that
needs a fix.

Can you please fix both (and grep for other files possibly needing a
fix) and include them in the "offical" readline-master.tar.gz?

Thank you!

Simon Sobisch
Maintainer of GnuCOBOL

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