Silence compiler warnings from bindgen tests

Author: raoulstrackx

mbedtls-sys/build/bindgen.rs

@@ -135,7 +135,7 @@ impl super::BuildConfig {
             .prepend_enum_name(false)
             .translate_enum_integer_types(true)
             .rustfmt_bindings(false)
-            .raw_line("#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals, invalid_value)]")
+            .raw_line("#![allow(dead_code, deref_nullptr, non_snake_case, non_camel_case_types, non_upper_case_globals, invalid_value)]")
             .generate()
             .expect("bindgen error")
             .to_string();