crypto: remove X25519 reimplementation

core/crypto/X25519.zig

@@ -1,17 +0,0 @@
-const std = @import("std");
-
-pub usingnamespace std.crypto.dh.X25519;
-
-const Self = @This();
-
-pub const PublicKey = [Self.public_length]u8;
-pub const SecretKey = [Self.secret_length]u8;
-
-// Reimplemented from std lib to work on freestanding.
-
-pub fn makeKeyPair(seed: [Self.seed_length]u8) !Self.KeyPair {
-    var kp: Self.KeyPair = undefined;
-    kp.secret_key = seed;
-    kp.public_key = try Self.recoverPublicKey(seed);
-    return kp;
-}