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Build time check of OFD lock is not sufficient and can cause image open errors when the runtime environment doesn't support it. Add a helper function to probe it at runtime, additionally. Also provide a qemu_has_ofd_lock() for callers to check the status. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>