3.9
Copied the sources from the distutils CVS repository.
Issue #22919: Windows build updated to support VC 14.0 (Visual Studio 2015), which will be used for the official 3.5 release.
bpo-41089: Filters and other issues in Visual Studio projects (GH-21070)
bpo-31569: correct PCBuild/ case to PCbuild/ in build scripts and docs (GH-3711)
bpo-37445: Include FORMAT_MESSAGE_IGNORE_INSERTS in FormatMessageW() calls (GH-14462)
Removes bdist_wininst dependency on MFC.
