bug#54633: [PATCH] * configure.ac: Fix --without-gif for W32, NS, Haiku, and PGTK.

[Eli Zaretskii <eliz@gnu.org>]

> Date: Wed, 30 Mar 2022 12:42:54 +0000
> From: Randy Taylor <dev@rjt.dev>
> Cc: 54633@debbugs.gnu.org
> 
> When I build Emacs I specify "--without-gif".
> 
> When using PGTK:
>   - With the original code and specifying "--without-gif", here is what configure gives me: Does Emacs use a gif library?                           yes -lgif
>   - With the patch and specifying "--without-gif", I get this (as expected): Does Emacs use a gif library?                           no
>   - With the patch, if I remove "--without-gif" or specify "--with-gif=yes", I get this (as expected): Does Emacs use a gif library?                           yes -lgif
> 
> When using X11:
>   - With the original code and specifying "--without-gif", here is what configure gives me (as expected): Does Emacs use a gif library?                           no
>   - With the original code and removing "--without-gif" or specifying "--with-gif="yes", here is what configure gives me (as expected): Does Emacs use a gif library?                           yes -lgif
> 
> The check in the code for "--without-gif" only applies to X11, but not the other systems.
> This patch fixes it to apply for all the systems in that check, in the same fashion as the SVG check (see line 2660 in configure.ac).

Thanks.  But your patch touched more than just the PGTK build.  For
w32, for example, I see no reason to make any changes; do you?
Likewise for NS.

Po Lu, do you agree that only PGTK needs a fix?  If co, can you
suggest a fix for PGTK only?