Changed 'build_extensions()' so 'sources' can be a list or tuple; and   call CCompiler method 'compile()' with 'include_dirs' not 'includes'. Fixed stupid typo in 'get_source_files()'.
Changed 'build_extensions()' so 'sources' can be a list or tuple; and
  call CCompiler method 'compile()' with 'include_dirs' not 'includes'.
Fixed stupid typo in 'get_source_files()'.

pypa/setuptools,pypa/setuptools,pypa/setuptools