qdoc: \relates command is unable to correctly handle function overloads

If there are two functions in the global scope, A and B, where

• B is an overload of A
• A is documented and uses \relates to associate it with a type
• B is undocumented or marked \internal

Then the node representing A is correctly 'adopted' by the type and A appears in the reference as a 'related non-member'. However, because the global scope still has the undocumented overload, trying to link to to the function using a unqualified name fails, even though one would expect to find it in the global scope. Qualifying the link with the type works as expected.