mxcl/homebrew — pull request #16038 by 2bits (2012-11-13 20:24:07+00:00)
Title: htmldoc: add libpng patch from svn

htmldoc builds with libpng-1.5 using a series of diffs between
the current version and svn r1668. These diffs were generated and
applied by Fedora. Doing same here. Builds well with superenv.
Noted in comments to remove at >= 1.8.28.

Fixes #15915