chore: Fix "unexpected `cfg` condition name" #203

Job	Run time
Clippy (stable)	26s
Build (stable, x86_64-unknown-linux-gnu)	37s
Build (MSRV)	1m 16s
Build (stable, i686-unknown-linux-musl)	32s
Build (nightly)	17s
Rustfmt (stable)	5s
Tests (stable)	40s
Loom tests (stable)	1m 25s
all systems go!	0s
	5m 18s

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