[issue8603] Create a bytes version of os.environ and getenvb()

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> There is a couple of white-space only changes in the patch; 
> it would be good if you could reduce them.

"When two paths open to you, you should always choose the most difficult" (in french: "Quand deux chemins s'ouvrent à nous, il faut toujours choisir le plus difficile"). I fixed posixmodule.c instead of my patch :-)

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<http://bugs.python.org/issue8603>
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