[issue12257] Use PYPACKAGING_USE_SDK envvar instead of DISTUTILS_USE_SDK

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

I don't think the name should be changed. If anything should be done, we should reconsider whether this flag is actually needed, or whether some other approach to selecting a compiler can be taken.

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<http://bugs.python.org/issue12257>
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