add #![cfg(any(feature ...))], to reduce warning in cargo test #4180

Job	Run time
Rustfmt	17s
Clippy	1m 19s
Init	4s
Examples (examples/actix_example)	2m 30s
Unit Test	3m 9s
Examples (examples/axum_example)	2m 29s
Examples (examples/basic)	1m 20s
Examples (examples/graphql_example)	2m 54s
Examples (examples/jsonrpsee_example)	2m 42s
Examples (examples/loco_example)	3m 10s
Examples (examples/poem_example)	2m 17s
Examples (examples/proxy_gluesql_example)	1m 20s
Examples (examples/rocket_example)	3m 11s
Examples (examples/rocket_okapi_example)	3m 12s
Examples (examples/salvo_example)	2m 46s
Examples (examples/seaography_example)	2m 38s
Examples (examples/tonic_example)	2m 31s
Compile MySQL (actix, native-tls)	2m 47s
Compile PostgreSQL (tokio, native-tls)	2m 56s
Compile SQLite (async-std, native-tls)	3m 2s
Compile PostgreSQL (tokio, rustls)	3m 8s
Compile MySQL (actix, rustls)	3m 3s
CLI	0s
Compile SQLite (async-std, rustls)	3m 4s
Issues Matrix	0s
Issues	0s
MariaDB (10.6, actix, native-tls)	2m 24s
MySQL (8, actix, native-tls)	3m 32s
MySQL (5.7, actix, native-tls)	3m 18s
Postgres (14.4, tokio, native-tls)	6m 45s
SQLite (async-std, native-tls)	4m 21s
SQLite (async-std, rustls)	4m 29s
	1h 20m 38s

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