core: expose tls features, ring is new default

Fixes librespot-org#1382

core/Cargo.toml

@@ -33,7 +33,7 @@ hyper = { version = "1.3", features = ["http1", "http2"] }
 hyper-util = { version = "0.1", features = ["client"] }
 http-body-util = "0.1.1"
 hyper-proxy2 = { version = "0.1", default-features = false, features = ["rustls"] }
-hyper-rustls = { version = "0.27.2", features = ["http2"] }
+hyper-rustls = { version = "0.27.2", default-features = false, features = ["http1", "http2", "native-tokio", "tls12"] }
 log = "0.4"
 nonzero_ext = "0.3"
 num-bigint = { version = "0.4", features = ["rand"] }
@@ -70,3 +70,8 @@ vergen-gitcl = { version = "1.0.0", default-features = false, features = ["build
 
 [dev-dependencies]
 tokio = { version = "1", features = ["macros", "parking_lot"] }
+
+[features]
+with-aws-lc-rs = ["hyper-rustls/aws-lc-rs"]
+with-ring = ["hyper-rustls/ring"]
+default = ["with-ring"]