Add the usual count element to E_LIGHT_TYPE enum.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4265 dfc29bdd-3216-0410-991c-e03cc46cb475

include/SLight.h

@@ -20,7 +20,10 @@ enum E_LIGHT_TYPE
 	//! spot light, it has a position in space, a direction, and a limited cone of influence
 	ELT_SPOT,
 	//! directional light, coming from a direction from an infinite distance
-	ELT_DIRECTIONAL
+	ELT_DIRECTIONAL,
+
+	//! Only used for counting the elements of this enum
+	ELT_COUNT
 };
 
 //! Names for light types