Let rv2cv-hook CVs’ protos participate in method intuition

Let rv2cv-hook CVs’ protos participate in method intuition

Commit 39c012bc2fc2f1cf wasn’t enough.  If a subroutine has a proto-
type beginning with * then its name is treated as a sub call, even
when followed by a package name:

    {package Foo}
    sub Foo {}
    foo Foo; # Foo->foo

    {package Bar}
    sub bar (*) {}
    bar Bar; # bar(Bar)

This was not applying to subs looked up via rv2cv hooks.