Put library version in XML string
Put library version in XML string

The context's library version is something that is not going to change
over time, and therefore it should be present in the XML representation
of the context.

Signed-off-by: Paul Cercueil <a027184a55211cd23e3f3094f1fdc728df5e0500@crapouillou.net>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio