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Since machine's canonical alias can be the same as other machine's
name, current all_machine_names() may return duplicates entries.
This causes the problem that the entry of "virt-5.0" appears twice in
machine selection menu when aarch64 is used.
So, fix this by just not adding the same entry twice.
Signed-off-by: Misono Tomohiro <misono.tm@gmail.com>