add JackPortNameCallback type and port rename callback (to match changes above, and to come into line with jack2)

jack.h

@@ -393,6 +393,17 @@ int jack_set_port_registration_callback (jack_client_t *,
 					 JackPortRegistrationCallback
 					 registration_callback, void *arg) JACK_OPTIONAL_WEAK_EXPORT;
 
+
+/**
+ * Tell the JACK server to call @a registration_callback whenever a
+ * port is registered or unregistered, passing @a arg as a parameter.
+ *
+ * @return 0 on success, otherwise a non-zero error code
+ */
+int jack_set_port_rename_callback (jack_client_t *,
+                                   JackPortRenameCallback
+                                   rename_callback, void *arg) JACK_OPTIONAL_WEAK_EXPORT;
+
 /**
  * Tell the JACK server to call @a connect_callback whenever a
  * port is connected or disconnected, passing @a arg as a parameter.

types.h

@@ -371,6 +371,17 @@ typedef int  (*JackSampleRateCallback)(jack_nframes_t nframes, void *arg);
  */ 
 typedef void (*JackPortRegistrationCallback)(jack_port_id_t port, int register, void *arg);
 
+/**
+ * Prototype for the client supplied function that is called 
+ * whenever a port is renamed
+ *
+ * @param port the ID of the port 
+ * @param arg pointer to a client supplied data
+ * @param old_name the name of the port before the rename was carried out
+ * @param new_name the name of the port after the rename was carried out
+ */ 
+typedef void (*JackPortRenameCallback)(jack_port_id_t port, const char* old_name, const char* new_name, void* arg);
+
 /**
  * Prototype for the client supplied function that is called 
  * whenever a client is registered or unregistered.