Updated py-setuptools to 24.0.3.

v24.0.3
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* Updated style in much of the codebase to match
  community expectations. See #632, #633, #634,
  #637, #639, #638, #642, #648.

v24.0.2
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* If MSVC++14 is needed ``setuptools.msvc`` now redirect
  user to Visual C++ Build Tools web page.

v24.0.1
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* #625 and #626: Fixes on ``setuptools.msvc`` mainly
  for Python 2 and Linux.

(wiz)