(svn r18781) -Codechange: pass the CommandCost to the callback instead of whether it succeeded or not.

-Fix: AIs did update their last cost incorrectly in network games if the cost of the DC_EXEC phase differed from the ~DC_EXEC phase.

src/gui.h

@@ -21,8 +21,6 @@
 #include "transport_type.h"
 
 /* main_gui.cpp */
-void CcPlaySound10(bool success, TileIndex tile, uint32 p1, uint32 p2);
-void CcBuildCanal(bool success, TileIndex tile, uint32 p1, uint32 p2);
 void HandleOnEditText(const char *str);
 void InitializeGUI();