ssb: Allow otherwise unrecognized incoming connections when not talking to strangers if they have a valid invite.

src/ssb.db.h

@@ -547,4 +547,12 @@ bool tf_ssb_db_is_account_familiar(sqlite3* db, const char* id, int depth);
 */
 int tf_ssb_sqlite_authorizer(void* user_data, int action_code, const char* arg0, const char* arg1, const char* arg2, const char* arg3);
 
+/**
+** Check if we have an invite for the given account.
+** @param db The database.
+** @param id The invite public key to check.
+** @return true If we have a valid invite for the address.
+*/
+bool tf_ssb_db_has_invite(sqlite3* db, const char* id);
+
 /** @} */