savestate shito: fix compile errors.

still far from being finished, so avoid using unless you want to spawn blackholes or some pretty bad shit.

src/NDS.h

@@ -109,7 +109,7 @@ void DeInit();
 void Reset();
 void Stop();
 
-void Savestate(Savestate* file);
+void DoSavestate(Savestate* file);
 
 bool LoadROM(const char* path, bool direct);
 void LoadBIOS();