[issue14843] support define_macros / undef_macros in setup.cfg

[Daniel Holth]

New submission from Daniel Holth <dholth at fastmail.fm>:

from build_ext.py:

        # XXX not honouring 'define_macros' or 'undef_macros' -- the
        # CCompiler API needs to change to accommodate this, and I
        # want to do one thing at a time!

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<http://bugs.python.org/issue14843>
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