[issue23970] Update distutils.msvccompiler for VC14

[Steve Dower]

Steve Dower added the comment:

Things are already 'broken' for the new compiler version, so Python won't build properly with older versions of VC anymore (there are a few more changes, like removing _PyVerify_fd, that will make this even less likely - the new CRT is for too incompatible with the old one, though it's much more compatible with other OSs).

If it's a big deal, I'll add the new compiler class as _msvccompiler.py and leave the old ones there as legacy code. That will save us from this discussion next time and avoid breaking people immediately (though there's almost certainly going to be subtle issues for them...)

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<http://bugs.python.org/issue23970>
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