Not used by any skin or extension from what I can see.
- https://codesearch.wmcloud.org/things/?q=makeI18nUrl&i=nope&files=&repos=
- https://codesearch.wmcloud.org/search/?q=makeUrl&i=nope&files=.*%5C.php&repos=
When deprecating/removing these functions be sure to update the bodies of other Skin methods such as makeInternalOrExternalUrl