Make avahi select LIBDAEMON instead of depending on it.

package/avahi/Config.in

@@ -1,6 +1,6 @@
 config BR2_PACKAGE_AVAHI
 	bool "avahi"
-	depends on BR2_PACKAGE_LIBDAEMON
+	select BR2_PACKAGE_LIBDAEMON
 	default n
 	help
 	  Avahi is a system which facilitates service