xfce4-weather-plugin: Make it work for a while by using different license info

Grabbed from [1]

This is a inztermediate solution until next version hopefully will use another weather
data supplier. There are proceedings ongoing [2].

[1] https://projects.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD?h=packages/xfce4-weather-plugin
[2] http://git.xfce.org/panel-plugins/xfce4-weather-plugin/log/



Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>