cerbero: allow passing multiple -v options
Allows easier overriding of variants where necessary.
The original comma separated format for splitting variants is preserved.
-v variant1,variant2 and -v variant1 -v variant2 are equivalent
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Allows easier overriding of variants where necessary.
The original comma separated format for splitting variants is preserved.
-v variant1,variant2 and -v variant1 -v variant2 are equivalent