So that the mf tests pass again on 32bit on the testbot, though they still fail locally with `LIBGL_ALWAYS_SOFTWARE=true GALLIUM_DRIVER=softpipe`.
-- v7: mf: Uninitialize renderer before creating mixer and presenter. mf: Release video renderer services before re-initializing. mf: Avoid leaking nodes in IMFTopoLoader_Load. mf/tests: Add some missing IMFActivate_ShutdownObject calls. mf/tests: Add more consistent reference count checks.