Fix broken compilation without rustls

Author: algesten

.github/workflows/test.yml

@@ -110,6 +110,7 @@ jobs:
           - brotli
           - json
           - native-tls
+          - rustls-no-provider
     env:
       RUST_BACKTRACE: "1"
       RUSTFLAGS: "-D dead_code -D unused-variables -D unused"

src/unversioned/transport/mod.rs

@@ -59,7 +59,7 @@ pub use self::socks::SocksConnector;
 
 pub use crate::proxy::ConnectProxyConnector;
 
-#[cfg(feature = "rustls")]
+#[cfg(feature = "_rustls")]
 pub use crate::tls::rustls::RustlsConnector;
 
 #[cfg(feature = "native-tls")]