Fixed the GtkSignalFunc typedef to read "(void)" instead of "()", which was
causing it to not build on my irix machine.
typedef void (*GtkClassInitFunc) (gpointer klass);
typedef void (*GtkObjectInitFunc) (gpointer object);
-typedef void (*GtkSignalFunc) ();
+typedef void (*GtkSignalFunc) (void);
typedef gint (*GtkFunction) (gpointer data);
typedef void (*GtkDestroyNotify) (gpointer data);
typedef void (*GtkCallbackMarshal) (GtkObject *object,