[issue14843] support define_macros / undef_macros in setup.cfg

[Daniel Holth]

Daniel Holth <dholth at fastmail.fm> added the comment:

A tuple of (macro, '1') seems to do the trick

define_macros has to be space-separated, not comma-separated

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hgrepos: +127

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