bug#32194: [PATCH] Use Gnulib regex for lib-src

[Paul Eggert]

Eli Zaretskii wrote:
> > From: Noam Postavsky <npostavs@gmail.com>
> > Date: Wed, 01 Aug 2018 20:58:22 -0400
> >
> > I think it might make sense to hold onto it, but I don't feel very
> > strongly about it.
>
> If it's useful, I think it should stay.

OK, revised patchset attached. This keeps the debugging code in question. I took 
the liberty of renaming DEBUG (which clashes with other DEBUGs) to 
EMACS_REGEX_DEBUG.

0001-Use-Gnulib-regex-for-lib-src.patch
Description: Text Data

0002-Simplify-regex-emacs-code-by-assuming-Emacs.patch
Description: Text Data

0003-Simplify-regex-emacs-by-assuming-Emacs-syntax.patch
Description: Text Data

0004-Remove-always-0-struct-re_pattern_buffer-members.patch
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