Flam3 3.0.1 recipe

Homebrew (www.brew.sh) recipe to install flam3, the flame renderer
of the electric sheep written by Scott Draves and Erik Reckase.

Includes patches to:

- avoid a seg fault (cfr https://code.google.com/p/flam3/issues/detail?id=10);

- use libpng >= 1.5 instead of libpng 1.2 (https://code.google.com/p/flam3/source/detail?r=164).
Added GPL v3 license