[Bug c++/69778] Bogus "qualifiers cannot be applied" error with redundant (but legal) 'typename'

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69778

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Bonus points if instead of creating a useless tree, the error uses %qv to print
the qualifiers, as the C FE does.