License of KoContextBarButton code in Calligra libs

[Aurélien Gâteau]

Hi,

As requested by Friedrich, I'd like to state that:

I am okay to relicense my contributions to the files
libs/widgets/KoContextBarButton.h & libs/widgets/KoContextBarButton.cpp
to the 
GNU Library General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any
later version.

Hope this is good enough.

Regards,
Aurélien