scripts/extract-ikconfig: add zstd compression support
Add extract-ikconfig support for kernel images compressed with zstd.
Signed-off-by: Thitat Auareesuksakul <thitat@flux.ci>
Tested-by: Nicolas Schier <n.schier@avm.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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