[3.14] gh-134160: Block multiple module initialization (GH-134773) (#134827)

gh-134160: Block multiple module initialization (GH-134773)
(cherry picked from commit 469a56470b1d8df03862d8ceb73aebca14772dcf)

Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>