[issue26876] Extend MSVCCompiler class to respect environment variables

[Steve Dower]

Steve Dower added the comment:

I'd rather only take the change to _msvccompiler and not the ones that are there for historical interest (a.k.a. backwards compatibility with people who never expect internal implementation details to change).

If any tools break because they're using the wrong compiler class, please file a bug against them.

I didn't check the 2.7 file, but the one for master is fine.

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<http://bugs.python.org/issue26876>
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