Turning APNG to on by default in graphics/png

[Andrey Chernov]

On Wed, May 25, 2011 at 02:28:20PM -0400, Mikhail T. wrote:
> I'd like to see this option on by default now. I think, it's been available (off 
> by default) long enough and I, for one, always turn it on for completeness. 
> There used to be concerns about security of animated PNG code, but today I can 
> not find any advisories fresher than 2008:
> 
>     http://osvdb.org/show/osvdb/48766

Wrong place to find advisores related to subj. See 
http://www.libpng.org/pub/png/libpng.html
page, right below yellow tables. Latest one fixed Feb 3 2011.

> Various Mozilla applications will then be able to LIB_DEPEND on the installed 
> png instead of building their own versions.

FYI: apng is quick hack to overcome animated gifs limitations and libpng 
author is strongly against it, suggesting to use more flexible mng 
instead: http://www.libpng.org/pub/mng/

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