meta-xfce: add intltool-native to DEPENDS

fix tons of messages as:

| WARNING: foo do_configure: Missing DEPENDS on intltool-native

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Armin Kuster <akuster808@gmail.com>