MFH: r400715

devel/py-game_sdl2: backport 32bit runtime fix after r394876

With cython-0.23 named enums maybe promoted to PyLong which can break
py-game_sdl2 consumers e.g.,

$ renpy
TypeError("'long' object is not iterable",)

GitHub: renpy/renpy#778
Approved by: ports-secteam (feld)