pygame: fix install with system python
Closes #134.
scipy: 0.14.0
scipy: Don't allow gcc with accelerate
matplotlib: skip C++ stdlib check
Homebrew unnecessarily complains that gcc and matplotlib are built with
different C++ stdlibs; this is fine. Since matplotlib does not use the
C++ interface of any external library, we don't need to perform this
check at all.
scipy: skip C++ stdlib check
Homebrew unnecessarily complains that gcc and scipy are built with
different C++ stdlibs; this is fine. Since scipy does not use the
C++ interface of any of its dependencies, we don't need to perform this
check at all.