[ITA] libpng, urw-base35-fonts, xmlto

[ASSI]

ASSI via Cygwin-apps writes:
> I'd be happy if you take over all these libraries (I was looking at them
> as they are used by Emacs and had security updates pending).  I will
> also look at Jansson.

I have pushed the jansson update to playground.

Regards,
Achim.
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