Fix broken compilation without rustls #2668

Job	Run time
build_versions (stable)	22s
build_versions (beta)	18s
build_versions (1.71.1)	24s
cargo-deny (aarch64-apple-ios)	23s
Test	1m 6s
cargo-deny (aarch64-linux-android)	19s
Test	53s
Docs	1m 45s
Test (charset)	1m 8s
cargo-deny (i686-pc-windows-gnu)	19s
cargo-deny (i686-pc-windows-msvc)	22s
Test (cookies)	1m 16s
Test (charset)	1m 0s
cargo-deny (i686-unknown-linux-gnu)	19s
Test (socks-proxy)	1m 5s
Lint	47s
cargo-deny (wasm32-unknown-unknown)	22s
Test (cookies)	1m 13s
Test (gzip)	1m 3s
cargo-deny (x86_64-apple-darwin)	25s
Test (brotli)	1m 0s
Test (socks-proxy)	1m 3s
cargo-deny (x86_64-apple-ios)	21s
Test (json)	1m 6s
Test (gzip)	52s
cargo-deny (x86_64-pc-windows-gnu)	20s
Test (brotli)	1m 4s
Test (native-tls)	1m 14s
cargo-deny (x86_64-pc-windows-msvc)	21s
Test (json)	56s
cargo-deny (x86_64-unknown-linux-gnu)	22s
Test (native-tls)	1m 9s
cargo-deny (x86_64-unknown-redox)	19s
Test (rustls-no-provider)	59s
	25m 55s

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