dkg-evrf crate

monero-oxide relies on ciphersuite, which is in-tree, yet we've made breaking
changes since. This commit adds a patch so
monero-oxide -> patches/ciphersuite -> crypto/ciphersuite, with
patches/ciphersuite resolving the breaking changes.

patches/ciphersuite/src/lib.rs

@@ -0,0 +1,5 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+
+pub use ciphersuite::*;
+#[cfg(feature = "ed25519")]
+use dalek_ff_group::Ed25519;