Tests

Add feature gate to precompiles #4090

Job	Run time
check	20s
check no_std	25s
clippy	1m 22s
check serde	29s
check no_std optimism	25s
docs	1m 20s
check std	32s
fmt	24s
test stable --no-default-features	29s
TyposCheck	4s
test stable	1m 19s
test stable --all-features	1m 38s
test beta --no-default-features	59s
test beta	2m 9s
test beta --all-features	2m 20s
test nightly --no-default-features	1m 6s
test nightly	2m 14s
test nightly --all-features	2m 20s
	19m 55s

Provide feedback