Prevent "nightly" feature use in libraries #471

Job	Run time
build (ubuntu-latest)	2m 27s
build (windows-latest)	4m 2s
build-other (wasm32-unknown-unknown, 1.61.0)	4m 51s
build-other (wasm32-unknown-unknown, stable)	1m 0s
test (macos-latest, 1.61.0)	4m 43s
build-other (wasm32-unknown-unknown, beta)	1m 0s
test (macos-latest, stable)	52s
build-other (wasm32-unknown-unknown, nightly)	1m 22s
test (macos-latest, beta)	52s
build-other (wasm32-wasi, 1.61.0)	4m 48s
build-other (wasm32-wasi, stable)	1m 10s
test (macos-latest, nightly)	1m 17s
build-other (wasm32-wasi, beta)	1m 10s
test (ubuntu-latest, 1.61.0)	4m 5s
build-other (wasm32-wasi, nightly)	1m 23s
test (ubuntu-latest, stable)	37s
test (ubuntu-latest, beta)	32s
build-other (x86_64-unknown-redox, 1.61.0)	5m 55s
test (ubuntu-latest, nightly)	52s
build-other (x86_64-unknown-redox, stable)	1m 1s
test (windows-latest, 1.61.0)	5m 13s
build-other (x86_64-unknown-redox, beta)	59s
test (windows-latest, stable)	1m 14s
build-other (x86_64-unknown-redox, nightly)	1m 24s
build-other (x86_64-fortanix-unknown-sgx, nightly)	1m 40s
test (windows-latest, beta)	56s
test (windows-latest, nightly)	1m 19s
	56m 44s

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