gpg: Split check_key_signature2.
* g10/sig-check.c (hash_uid_node): Rename from this... (hash_uid_packet): ... to this. Take a PKT_user_id instead of a KBNODE. (check_key_signature2): Split the basic signature checking functionality into... (check_signature_over_key_or_uid): ... this new function.
- Signed-off-by: Neal H. Walfield <neal@g10code.com>