Bento4

Bento4 is a C++ library and command line tool set for manipulating MP4 files. This adds a formula for it to Homebrew (duh).

Tested to work with Xcode 4.4 CLT, both with and without --HEAD. Would not work at all without patching, since it by default tries to build for -arch ppc (broken since Xcode 4.0) and with the MacOSX10.4 SDK (not shipped with Xcode 4.4 at least).