mkinitcpio: Add support for the zstd compressor
Created by: luca020400
This mainly for testing purposes until https://lkml.org/lkml/2020/7/23/1010 is merged in mainline. Then this patch can be safely applied
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Created by: luca020400
This mainly for testing purposes until https://lkml.org/lkml/2020/7/23/1010 is merged in mainline. Then this patch can be safely applied