Avoid dynamic use (unpacking) of Python M2Crypto .egg file.
The FreeBSD port just installs the zipped .egg file for M2Crypto and there is no option to make or install an unzipped version. Unfortunately, the zipped version gets unpacked, per-user when it is first used and the directory it is unpacked to is not always writable. To avoid unsightly "permission denied" failures, we run a post-package-install phase to manually unpack the .egg in the python site-library directory. This is wicked ugly and I really should be flogged for doing this...