RFU: optipng 0.6.4-1 (libpng14)

[Jari Aalto]

New upstream release, compiled against libpng14

wget --recursive --no-host-directories --cut-dirs=3 \
    http://cante.net/~jaalto/tmp/cygwin/optipng/optipng-0.6.4-1-src.tar.bz2 \
    http://cante.net/~jaalto/tmp/cygwin/optipng/optipng-0.6.4-1.tar.bz2 \
    http://cante.net/~jaalto/tmp/cygwin/optipng/setup.hint

Jari