add #![cfg(any(feature ...))], to reduce warning in cargo test (#2177) #4211

Job	Run time
Clippy	1m 8s
Init	3s
Examples (examples/actix_example)	2m 9s
Rustfmt	14s
Examples (examples/axum_example)	2m 6s
Unit Test	2m 9s
Examples (examples/basic)	1m 4s
Examples (examples/graphql_example)	2m 8s
Examples (examples/jsonrpsee_example)	2m 8s
Examples (examples/loco_example)	2m 9s
Examples (examples/poem_example)	2m 3s
Examples (examples/proxy_gluesql_example)	1m 16s
Examples (examples/rocket_example)	2m 10s
Examples (examples/rocket_okapi_example)	2m 9s
Examples (examples/salvo_example)	2m 7s
Examples (examples/seaography_example)	2m 7s
Examples (examples/tonic_example)	2m 6s
Compile PostgreSQL (tokio, native-tls)	1m 59s
Compile PostgreSQL (tokio, rustls)	1m 59s
Compile MySQL (actix, native-tls)	1m 58s
Compile SQLite (async-std, native-tls)	56s
CLI	0s
Compile MySQL (actix, rustls)	2m 0s
Compile SQLite (async-std, rustls)	56s
Issues Matrix	0s
Issues	0s
Postgres	1s
MySQL	1s
MariaDB	1s
SQLite	1s
	39m 8s

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