Fix Windows build

src/boe.startup.cpp

@@ -131,7 +131,7 @@ bool handle_startup_press(location the_point) {
 	return false;
 }
 
-extern int display_mode;
+extern short display_mode;
 extern bool show_startup_splash;
 
 void handle_splash_events() {

src/tools/resmgr/resmgr.hpp

@@ -175,8 +175,7 @@ namespace ResMgr {
 	template<typename type> bool have(std::string name) {
 		if(resPool<type>::resources().find(name) != resPool<type>::resources().end())
 			return true;
-		resLoader<type> load;
-		return resPool<type>::find(name, load.file_ext).is_absolute();
+		return resPool<type>::find(name, resLoader<type>::file_ext).is_absolute();
 	}
 	
 	/// Check if a resource with the given numerical ID exists