(svn r26205) -Feature: SSE 4.1 sprite sorter, improving the sorting performance significantly (MJP)

For example with GCC 4.8, x86_64 Linux, Intel i5-3337U this patch improves the performance of Pile, Treham and Hamac test save games by about 10% in over-all run time at fast forward at 1920x1080 when zoomed out and when trees are not disabled.

src/openttd.cpp

@@ -62,13 +62,12 @@
 #include "town.h"
 #include "subsidy_func.h"
 #include "gfx_layout.h"
-
+#include "viewport_sprite_sorter.h"
 
 #include "linkgraph/linkgraphschedule.h"
 
 #include <stdarg.h>
 
-
 void CallLandscapeTick();
 void IncreaseDate();
 void DoPaletteAnimations();
@@ -775,6 +774,8 @@ int openttd_main(int argc, char *argv[])
 	}
 	free(videodriver);
 
+	InitializeSpriteSorter();
+
 	/* Initialize the zoom level of the screen to normal */
 	_screen.zoom = ZOOM_LVL_NORMAL;