* Initial python-3.7 port
* python3: Add setup.config.in to remove before patching
* python3: Implement setenv for mingw. Fix building with NT threads. Build
with unicode
* Fix typos
* Fix linking core modules
* Mingw build have exec_prefix
* Remove deprecated patch
* Fix building python and modules. Failing to build readline module and
install not working yet
* More getpath changes and more aggressive path separator conversion
* Fix readline module compilation and linking errors
* python3: By default building with posix threads, NT threads are broken.
Some patches optimization. First buildable commit
* Py_DecodeLocale handle char, not wchar
* Fix building multiprocessing module with posix threads
With non-mingw builds POSIX_SEMAPHORES_NOT_ENABLED is not enabled and
sem_unlink is a no-op. Change it to always be provided on Windows instead.
This adds a minimal test suite which makes it easier to catch regressions
in the future for common MSYS2 related bugs.
