[Bug ada/123003] missing warning for unused use clause when use clause for child package is present

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123003

--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Let's not conflate different issues though, especially when the subsequent ones
are far less interesting and appear to be quite artificial...