ksys/res: Implement more ResourceUnit functions

src/KingSystem/Resource/resSystem.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <prim/seadSafeString.h>
+
 namespace ksys::res {
 
 // In release builds, the only thing this function does is return 1.
@@ -12,6 +14,6 @@ bool returnFalse();
 
 // In release builds, the only thing this function does is return 0.
 // TODO: figure out what this is used for. Stubbed log function?
-bool returnFalse2();
+bool returnFalse2(const sead::SafeString&);
 
 }  // namespace ksys::res