Fix FFI

Author: thomaseizinger

boringtun/src/ffi/mod.rs

@@ -13,6 +13,7 @@ use hex::encode as encode_hex;
 use libc::{raise, SIGSEGV};
 use parking_lot::Mutex;
 use rand::rngs::OsRng;
+use rand::TryRngCore;
 use tracing;
 use tracing_subscriber::fmt;