changes to RW layer so loading foreign files works

src/rw/RwHelper.h

@@ -56,6 +56,8 @@ RwCamera *CameraCreate(RwInt32 width,
 void _TexturePoolsInitialise();
 void _TexturePoolsShutdown();
 
+RpAtomic *ConvertPlatformAtomic(RpAtomic *atomic, void *data);
+
 #if defined(FIX_BUGS) && defined (GTA_PC)
 void SetAlphaTest(RwUInt32 alpharef);
 void RestoreAlphaTest();