Fix *-qualification of named parameters in SQL-language functions.
Given a composite-type parameter named x, "1ドル.*" worked fine, but "x.*"
not so much. This has been broken since named parameter references were
added in commit
9bff0780cf5be2193a5bad0d3df2dbe143085264, so patch back
to 9.2. Per bug #9085 from Hardy Falk.