Revert "macosx: NSScreen dealloc is not only called at end of execution of course."

This was even worse. +load() != init()
This reverts commit b5feb899.

modules/gui/macosx/misc.m

@@ -129,14 +129,13 @@ static NSMutableArray *blackoutWindows = NULL;
 + (void)load
 {
     /* init our fake object attribute */
-    if( !blackoutWindows )
-        blackoutWindows = [NSMutableArray arrayWithCapacity:1];
+    blackoutWindows = [[NSMutableArray alloc] initWithCapacity:1];
 }
 
 - (void)dealloc
 {
-    [blackoutWindows makeObjectsPerformSelector:@selector(close)];
     [blackoutWindows removeAllObjects];
+    [blackoutWindows release];
     [super dealloc];
 }