use new readline function types (closes #20374)

References:
* ce75105
* https://bugs.python.org/issue20374

See 0ac0ead

…ne with libedit."

See b0fd12d

This commit integrates changes originally added to the project
as python-cmake-buildsystem/python-cmake-buildsystem@18d49757e (Mingw32 support, and add cmake
options for disabling)

Note that in  more recent version of Python, this patch is obsoleted
by the following commits:

  See 589f89e2a (introduced in 3.3)
      Removed a Windows 9x trick used before LoadLibraryExW.
      Windows 9x has long been unsupported and the result of GetFullPathName was not even
      being used in the first place.

  See 05f2d84ca (introduced in 3.9)
      bpo-28269: Replace strcasecmp with system function _stricmp. (GH-13095)

Co-authored-by: David Sansome <me@davidsansome.com>

This commit integrates changes originally added to the project
as python-cmake-buildsystem/python-cmake-buildsystem@18d49757e (Mingw32 support, and add
cmake options for disabling)

Note that in more recent version of Python, this patch is obsoleted
by the following commits:

- See 7faf70512 (introduced in 3.4)
      Issue #17591: Use lowercase filenames when including Windows header files.

Co-authored-by: David Sansome <me@davidsansome.com>

This commit integrates changes originally added to the project
as python-cmake-buildsystem/python-cmake-buildsystem@18de7ac65 (Fix the nt module)
and python-cmake-buildsystem/python-cmake-buildsystem@a2606f959 (config-mingw: Add
(i686|x86_64)-w64-mingw32 toolchain support from MXE)

Co-authored-by: David Sansome <me@davidsansome.com>

This commit integrates changes originally added to the project
as python-cmake-buildsystem/python-cmake-buildsystem@9fdd1408b (Build the ctypes extension
differently on Windows, add a patch to bring in the latest version
of libffi) and python-cmake-buildsystem/python-cmake-buildsystem@025343fba (Add a missing
patch to ctypes for windows)

Co-authored-by: David Sansome <me@davidsansome.com>