Kernelspace xenstore builds again via mirage

This requires the xenstore dependency to be removed from mirage-xen
to make this a clean built (since mirage-xen depends on this repo for
the xenstore library)

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Add missing OASIS output

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
update CHANGES

Signed-off-by: David Scott <dave.scott@eu.citrix.com>