Clean headers a bit

src/mapnode.h

@@ -21,11 +21,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define MAPNODE_HEADER
 
 #include <iostream>
-#include "common_irrlicht.h"
+#include "irrlichttypes.h"
 #include "light.h"
 #include "exceptions.h"
 #include "serialization.h"
-#include "materials.h"
 #ifndef SERVER
 #include "tile.h"
 #endif

src/mapnode_contentfeatures.h

@@ -26,6 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #ifndef SERVER
 #include "tile.h"
 #endif
+#include "materials.h" // DiggingProperties
 
 /*
 	Content feature list