chore: only prepend Dalli patch if binary protocol defined #1489
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Description
Follow up to #1480.
We removed the binary protocol from Shopify's fork of Dalli (Shopify/dalli#13) since it is officially deprecated by Memcached (https://docs.memcached.org/protocols/#why-is-the-binary-protocol-deprecated). I know it's also on upstream Dalli's roadmap to remove it as well. So this PR just ensures that
::Dalli::Protocol::Binaryis defined before applying the patch.