(svn r10300) -Fix [FS#917]: give a better explanation why the loading of a savegame failed and do not crash on loading savegames that were altered by patches or branches.

src/saveload.h

@@ -28,6 +28,8 @@ enum SaveOrLoadMode {
 	SL_BMP      =  4,
 };
 
+void SetSaveLoadError(uint16 str);
+const char *GetSaveLoadErrorString();
 SaveOrLoadResult SaveOrLoad(const char *filename, int mode, Subdirectory sb);
 void WaitTillSaved();
 void DoExitSave();