* bpo-35296: make install now installs the internal API (GH-10665)
make install now also installs the internal API: Include/internal/*.h
header files.
(cherry picked from commit f653fd4d95)
* Windows installer now also install Include/internal/
The Windows installer (MSI) now also install header files of the
Include/internal/ subdirectory.
Miss Islington (bot)
Victor Stinner
Steve Dower