add missing feature (#4355)

24 jobs for master in 42 minutes (queued for 8 seconds)
Name Stage Failure
failed
spellcheck Test
[2021-11-24T01:05:39Z INFO  cargo_spellcheck::action] ✅ /builds/parity/polkadot/utils/staking-miner/src/monitor.rs
[2021-11-24T01:05:39Z INFO cargo_spellcheck::action] ✅ /builds/parity/polkadot/utils/staking-miner/src/prelude.rs
[2021-11-24T01:05:39Z INFO cargo_spellcheck::action] ✅ /builds/parity/polkadot/utils/staking-miner/src/dry_run.rs

real 2m0.100s
user 17m48.102s
sys 5m26.398s
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
check-dependent-cumulus Build
    ... which satisfies dependency `rand = "=0.7.3"` of package `cumulus-test-service v0.1.0 (/builds/parity/polkadot/cumulus/test/service)`
... which satisfies path dependency `cumulus-test-service` of package `cumulus-client-network v0.1.0 (/builds/parity/polkadot/cumulus/client/network)`
... which satisfies path dependency `cumulus-client-network` of package `cumulus-client-collator v0.1.0 (/builds/parity/polkadot/cumulus/client/collator)`
... which satisfies path dependency `cumulus-client-collator` of package `cumulus-client-service v0.1.0 (/builds/parity/polkadot/cumulus/client/service)`
... which satisfies path dependency `cumulus-client-service` of package `parachain-template-node v0.1.0 (/builds/parity/polkadot/cumulus/parachain-template/node)`

failed to select a version for `libc` which could resolve this conflict
Cleaning up file based variables
ERROR: Job failed: exit code 1