For the confused reader (including myself):
My patch to add libxo supprt to devinfo was added in c759aca606cee8352
and then later reverted in 43b07bdbc5d24febc7a
and then @kgalazka revived this thread with a concrete fix, but there is more to it

A clean merge of my patch toghether with this fix on top of e8d6b58ef5a4afe0 would
address the problems I'm aware of, and hopefully provide the feature as intended.
There's deeper issues being raised though, seemingly related to each other.