Remove unnecessary_transmutes warnings

Author: yogh333

ledger_secure_sdk_sys/src/lib.rs

@@ -2,6 +2,7 @@
 #![allow(non_upper_case_globals)]
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
+#![allow(unnecessary_transmutes)]
 
 use core::ffi::c_void;
 #[cfg(all(feature = "heap"))]