qemu: add memory-backend-memfd capability check
Check availability of "-object memory-backend-memfd". Reviewed-by: NJohn Ferlan <jferlan@redhat.com> Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: NJohn Ferlan <jferlan@redhat.com> Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
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