xen: import ring.h from xen
Do not use the ring.h header installed on the system. Instead, import the header into the QEMU codebase. This avoids problems when QEMU is built against a Xen version too old to provide all the ring macros. Signed-off-by: NStefano Stabellini <stefano@aporeto.com> Reviewed-by: NGreg Kurz <groug@kaod.org> CC: anthony.perard@citrix.com CC: jgross@suse.com
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