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Implements the Distutils 'build_clib' command, to build a C/C++ library
that is included in the module distribution and needed by an extension
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a` Ensure that the list of libraries is valid.
`library` is presumably provided as a command option 'libraries'.
This method checks that it is a list of 2-tuples, where the tuples
are (library_name, build_info_dict).
Raise DistutilsSetupError if the structure is invalid anywhere;
just returns otherwise.
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