libreoffice: add packageconfigs for gtk/gtk3/mariadb
libreoffice: add packageconfigs for gtk/gtk3/mariadb

* gtk mariadb enabled by default
* gtk3 theming is broken at least for xfce4 so disaböe it

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@googlemail.com>

schnitzeltony/meta-office,schnitzeltony/meta-libreoffice