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1413d67748
This allows apps to destroy the window and renderer in either order, but
makes sure that the renderer can properly clean up its resources while OpenGL
contexts and libraries are still loaded, etc.
If the window is destroyed first, the renderer is (mostly) destroyed but its
pointer remains valid. Attempts to use the renderer will return an error,
but it can still be explicitly destroyed, at which time the struct is free'd.
If the renderer is destroyed first, everything works as before, and a new
renderer can still be created on the existing window.
Fixes #10174.
(cherry picked from commit cab3defc18)