sdl consumer may require SDL12COMPAT_NO_QUIT_VIDEO

[schauveau]

SDL1 is often being replaced by https://github.com/libsdl-org/sdl12-compat , a compatibility wrapper around SDL2.

Applications using the sdl consumer may experience some problems as shown in this Flowblade bug report https://github.com/jliljebl/flowblade/issues/1134

The solution appears to be SDL12COMPAT_NO_QUIT_VIDEO=1, a currently undocumented environment variable of sdl12-compat. https://github.com/libsdl-org/sdl12-compat/issues/329