bpo-36146: Don't run code at setup.py top level (GH-12127)

* Move set_compiler_flags() calls and concurrent.future hack from
  module top-level to main()
* Remove unused variables 'macros' and 'libraries' from
  detect_multiprocessing().
* Move SUMMARY and CLASSIFIERS constants at the top, move
  set_compiler_flags() function below these constants.
* Add some empty new lines to respect PEP 8.