RFU: optipng 0.7.2-1 (libpng)

[Jari Aalto]

wget --recursive --no-host-directories --cut-dirs=3 \
    http://cante.net/~jaalto/tmp/cygwin/optipng/optipng-0.7.2-1-src.tar.bz2 \
    http://cante.net/~jaalto/tmp/cygwin/optipng/optipng-0.7.2-1.tar.bz2 \
    http://cante.net/~jaalto/tmp/cygwin/optipng/setup.hint

Updated to latest libpng, oldest can be removed,
Jari