Remove check for PYTHONDONTWRITEBYTECODE

[jaraco]

Virtualenv is opinionated about the user's environment. It claims that PYTHONDONTWRITEBYTECODE is not compatible with setuptools, though the code makes no reference to a bug report or other indication as to why setuptools is not compatible.

Presumably, with 0.7, setuptools is now compatible with that variable. This check should probably be removed. Is there anything else that needs to be done?

[pnasrat]

For background see #179

We can remove it when we enforce setuptools >= 0.7 as per Issue #428

I've been a bit out of the loop lately on that - I guess just submit a PR to remove this and next release should have this in (thus added to milestone).

[jaraco]

Thanks for the lead. I found the distribute bug report which references the fix. I've confirmed this fix is part of setuptools 0.7.

I was recommending using old versions of setuptools to upgrade to the latest:

virtualenv --setuptools env
env/bin/easy_install <setuptools-0.7b4>

But that technique won't work when PYTHONDONTWRITEBYTECODE is set. Alas, this raises the importance of setuptools #4.

[pfmoore]

Pull request #432 removes this check (as part of the larger change to switch to setuptools 0.7+)

[pfmoore]

Pull request #432 now merged.