(svn r6631) -Codechange: Use accessors for click_state.

Another step toward merging XTDwidget.
The only two files not converted (window.h and widget.c) will be done at the very last commit)

industry_gui.c

@@ -50,8 +50,7 @@ static void BuildIndustryWndProc(Window *w, WindowEvent *e)
 		break;
 
 	case WE_ABORT_PLACE_OBJ:
-		w->click_state = 0;
-		SetWindowDirty(w);
+		RaiseWindowButtons(w);
 		break;
 	}
 }