Remove last use of distutils.sysconfig from the stdlib (#11364).
Remove last use of distutils.sysconfig from the stdlib (#11364).

Apart from distutils itself, the stdlib has now officially switched to
the new top-level sysconfig module.  Patch greenlighted by Ned Deily.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator