bpo-32604: Make _xxsubinterpreters build on Windows (GH-5624)

This is not the ideal solution; this means that a test module is now
always included in the main python3x.dll.  However, we're already
including xxsubtype, so why not?
(cherry picked from commit 310b05289b5d9550040f469e60b5e8e77f1022b6)

Co-authored-by: Zachary Ware <zachary.ware@gmail.com>
2 files changed