A bunch of changes for the SQLITE3 backend:

1. fix for bug #528467 (C_UnwrapKey didn't work with DSA and EC private keys)
2. fix for bug #526231 (C_GetAttributeValue didn't correctly work)
3. partial fix for bug #564011 (object ID race on keypairgen)
4. use sqlite3 in ports (there is no reason to compile the bundled one)

Approved by: no objections by marcus and gnome team