dix and others: remove unused arraySize field from ScreenInfo

Bizarre. This seems to never be used before. I left the field in ScreenInfo,
with another name. So, stop looking at it.

Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com>
Reviewed-by: Aaron Plattner <aplattner@nvidia.com>

dix/main.c

@@ -190,7 +190,6 @@ int main(int argc, char *argv[], char *envp[])
 	    FatalError("couldn't init server resources");
 
 	SetInputCheck(&alwaysCheckForInput[0], &alwaysCheckForInput[1]);
-	screenInfo.arraySize = MAXSCREENS;
 	screenInfo.numScreens = 0;
 
 	InitAtoms();