bump(dev-lang/python): Pull in 2.7.5 ebuild from upstream Gentoo.
fix(dev-lang/python): Update python build for cross-compiling.

Port the ChromiumOS distutils and site patches from 2.7.3 to 2.7.5 and
add some additional exports to make autoconf happy.
Merge pull request #210 from marineam/python

Python 2.7.5