[maybe patch] allow fullscreened apps on head "0" with xinerama

this patch by Diego Petteno allows you to set
SDL_VIDEO_FULLSCREEN_HEAD to 0 to indicate you want to use just head “0”.
right now SDL will treat a value as “0” as meaning “unset”.

i’m not sure this patch is still needed as i’m not familiar with the xinerama
code, but a quick glance makes me think it is …
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