Support for libnotify >= 0.7.0

The most recent developer version of libnotify changed the signature for
notify_notification_new(). Make the configure script detect the version
of libnotify and use the according function signature.

configure.ac

@@ -42,6 +42,12 @@ Use --disable-notifications to disable desktop notifications.]) ]
 	)
 	AC_SUBST(LIBNOTIFY_CFLAGS)
 	AC_SUBST(LIBNOTIFY_LIBS)
+	PKG_CHECK_MODULES(LIBNOTIFY_OLD, libnotify < 0.7.0,
+		[ AC_MSG_NOTICE([Using old libnotify API.])
+		  AC_DEFINE([HAVE_LIBNOTIFY_OLD], [1],
+			    [Define to 1 if libnotify version is below 0.7.0]) ],
+		[ AC_MSG_NOTICE([Using new libnotify API.]) ]
+	)
 fi
 
 # Checks for header files.

src/notify.c

@@ -12,7 +12,11 @@ void nall_notify_init(void)
 
 void nall_notify(run_data_t* s)
 {
+#ifdef HAVE_LIBNOTIFY_OLD
 	NotifyNotification* notification = notify_notification_new(s->name, s->buf, NULL, NULL);
+#else
+	NotifyNotification* notification = notify_notification_new(s->name, s->buf, NULL);
+#endif
 	if (s->status == 0)
 		notify_notification_set_urgency(notification, NOTIFY_URGENCY_NORMAL);
 	else