build(cargo): add target feature for x86_64-unknown-linux-gnu #2192

Job	Run time
Docker build and push to Docker Hub	0s
Coverage	5m 5s
Build documentation	2m 22s
Test (false, stable)	2m 45s
Test (false, beta)	3m 4s
Test (nightly, true)	2m 52s
	16m 8s

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