+mirage-xen.1.1.1
Merge pull request #1720 from Chris00/master

oasis2opam 0.4.0 for oasis 0.4.2
Merge pull request #1719 from mirage/master

+mirage-xen.1.1.1
Add a "&" to separate and clauses

Fixes https://github.com/ocaml/opam-repository/issues/1721