- clipped selection circle in colorpicker to prevent it drawing outside

the color plane
- removed warnings from glutil.c, made circleXOR call become float instead
  of short
- fixed error in drawing text of buttons in pop-up menus, when zoomed small

source/blender/src/interface.c

@@ -477,6 +477,8 @@ static void ui_positionblock(uiBlock *block, uiBut *but)
 		bt->y2 += yof;
 
 		bt->aspect= 1.0;
+		// check_but recalculates drawstring size in pixels
+		ui_check_but(bt);
 		
 		bt= bt->next;
 	}