Use [lints] to address unexpected_cfgs lint #831

Job	Run time
minrust	1m 52s
loom	18s
cross (i686-unknown-linux-gnu)	27s
miri	15m 14s
cross (armv7-unknown-linux-gnueabihf)	32s
cross (powerpc-unknown-linux-gnu)	25s
nightly	1m 17s
panic=abort tests	30s
cross (powerpc64-unknown-linux-gnu)	24s
rustfmt	7s
cross (wasm32-unknown-unknown)	12s
stable (ubuntu-latest)	1m 35s
tsan	1m 24s
stable (macos-latest)	1m 27s
stable (windows-latest)	3m 35s
Publish Documentation	13s
	29m 32s

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