prevent loading savestates that are too recent

src/Savestate.cpp

@@ -110,7 +110,12 @@ Savestate::Savestate(const char* filename, bool save)
         }
 
         fread(&VersionMinor, 2, 1, file);
-        // TODO: handle it???
+        if (VersionMinor > SAVESTATE_MINOR)
+        {
+            printf("savestate: state from the future, %d > %d\n", VersionMinor, SAVESTATE_MINOR);
+            Error = true;
+            return;
+        }
 
         buf = 0;
         fread(&buf, 4, 1, file);