v2.7.6 fix ECC 384 signature
https://github.com/Neilpang/acme.sh/issues/1130 https://github.com/Neilpang/acme.sh/issues/990
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https://github.com/Neilpang/acme.sh/issues/1130 https://github.com/Neilpang/acme.sh/issues/990