bug#7716: 23.2.91; Pretest Windows binary doesn't support PNG images

[Eli Zaretskii]

> From: Sean Sieger <sean.sieger@gmail.com>
> Date: Sat, 25 Dec 2010 05:58:24 -0500
> Cc: 
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
>     > and http://www.libpng.org/pub/png/libpng.html
>     > 
>     > libpng version 1.4.3 - June 26, 2010
> 
>     Are there Windows binaries available for this version of libpng
>     somewhere?  The GnuWin32 binaries are for version 1.2.37, not for
>     1.4.x.  This could be the source of incompatibilities which could
>     potentially prevent display of PNG images.  I see some hits in Google
>     for "libpng 1.4 vs 1.2 incompatibilities", and they seem to say that
>     these two versions are indeed incompatible.
> 
>     FWIW, I have headers and binaries for version 1.2.8.
> 
> There are security issues with those.

There's only one security issue with version 1.2.37, the latest one
available from GnuWin32, and that issue is only relevant to web
browsers.

Anyway, compiling an MS-Windows binary with a library for which
there's no binary DLL available seems useless to me.  If you want to
build with version 1.4.x, please build also the DLL and make it
available.