(svn r18809) -Codechange/Cleanup: remove unneeded headers from some files, if a header require a header make it include that header

src/newgrf_canal.h

@@ -12,6 +12,10 @@
 #ifndef NEWGRF_CANAL_H
 #define NEWGRF_CANAL_H
 
+#include "gfx_type.h"
+#include "tile_type.h"
+#include "newgrf_generic.h"
+
 /** List of different canal 'features'.
  * Each feature gets an entry in the canal spritegroup table */
 enum CanalFeature {