[Distutils] No >, >=, <, <= in environment markers spec

[Daniel Holth]

Noticed that there is no >= etc. in the environment markers spec, but
both environment markers implementations allow it. Shall I fix the
spec?

As of wheel 0.9.5, you can add to your setup.cfg lines to be included
as Requires-Dist: in the output METADATA. They supplement setup.py's
values. Only problem is they are only resolved during install from
wheel, and not during an install directly from the sdist.

[metadata]
requires_dist = beaglevote; python_version == 2.7
   reportlab
   quux; sys.platform == 'win32'