(svn r4614) CodeChange : Cleanup of industry_cmd (Step-4).

Removing the _industry_type_costs in favor of IndustrySpec.cost_multiplier;
In order to let industry_gui use the GetIndustrySpec accessor,
some structs had to be moved in industry.h

industry_map.h

@@ -9,7 +9,6 @@
 #include "macros.h"
 #include "tile.h"
 
-typedef byte IndustryGfx;
 
 
 /**