bug#70889: 29.3; GCC14.1 MinGW compilation error

[Eli Zaretskii]

> Date: Sun, 12 May 2024 12:18:53 -0700
> Cc: 70889@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> 
> On 2024-05-12 10:16, Eli Zaretskii wrote:
> 
> >> Oh, I hadn't seen that. Yep, with this flag the configure script's
> >> errors turn into warnings and subsequent the compilation error is
> >> gone.
> > 
> > Then I guess we should use that on MS-Windows when running the
> > configure script.  Paul, is there a better way.
> 
> In the short run, having 'configure' use 
> -Wno-error=implicit-function-declaration on MS-Windows should work 
> around the issue. Eventually, though, I suspect it'll cause further 
> problems, as the C standard indeed prohibits implicit function declarations.

I didn't mean to use this when building Emacs, only when running the
test programs of the configure script.