(svn r11774) -Change: do not include variables.h in a header when it is not needed.

source.list

@@ -262,6 +262,7 @@ road_cmd.cpp
 roadveh_cmd.cpp
 ship_cmd.cpp
 station_cmd.cpp
+terraform_cmd.cpp
 timetable_cmd.cpp
 town_cmd.cpp
 train_cmd.cpp