meta-xfce/README: mention meta-gnome in layers required
meta-xfce/README: mention meta-gnome in layers required

form a quick glance meta-xfce at least requires libwnck and gvfs to
build an run properly.

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@googlemail.com>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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