bug#63016: make it easier to build with development versions of PCRE2

[Paul Eggert]

On 2023-04-28 23:42, Jim Meyering wrote:
> On Sat, Apr 22, 2023 at 6:08 PM Carlo Marcelo Arenas Belón
> <carenas@gmail.com> wrote:
> > Building against a different version of PCRE2 that the one that is provided
> > with the system is complicated by the fact that unlike what is advertised,
> > if a pkg-config module for libpcre2-8 is found, it will override the values
> > that were provided with PCRE_CFLAGS and PCRE_LIBS.
>
> Thank you. Pushed.

I installed the attached minor fixup for that, to handle "./configure 
PCRE_CFLAGS= PCRE_LIBS=".

0001-build-support-explicit-PCRE_CFLAGS-PCRE_LIBS.patch
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