Re: libpng version 1.6.38

> pngcp and pngfix still need fixing

Glenn dropped pngcp because it clashes with a pre-existing command of the
same name; you can just delete it.  pngfix is still distributed but its
utility is limited; it was mainly there to fix up PNG files with a
particular zlib data bug.  I don't think it is necessary any longer.  Pull
it and see who screams.  In fact the whole of contrib/tools can go; contrib
is there to avoid transfer of copyright, contrib/tools is there as a
sort-of compromise for things involved in development process.   Nothing in
contrib/tools is used in the build.

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