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Implements the Distutils 'config' command, a (mostly) empty command class
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at least they're all named the same, and users always see "config" in the
list of standard commands. Also, this is a good place to put common
configure-like tasks: "try to compile this C code", or "figure out where
this header file lives".
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and set 'decl' true in the same call, or you might get errors about
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