Fix comment

```diff
-                    // Non-native builds likely don't have support for ctime (hence disable it there)
-                    // TODO: Better check for availability of ctime functions?
+                    /* Non-native builds likely don't have support for ctime (hence disable it there)
+                     * TODO: Better check for availability of ctime functions? */
```

would be nicer, I guess, but that is a matter of opinion :-)