Allow `build-std` to take an array of crate names #4229

Job	Run time
clippy (macos-latest)	25s
clippy (ubuntu-latest)	22s
clippy (windows-latest)	45s
fmt	12s
cargo-deny	19s
shellcheck	14s
test (macos-latest)	1m 21s
test (ubuntu-latest)	1m 5s
check	21s
test (windows-latest)	2m 44s
generate-matrix	25s
bisect	4m 43s
docker-in-docker	3m 57s
foreign	3m 8s
target (${{ matrix.pretty }},${{ matrix.os }})	0s
remote	2m 3s
podman	2m 25s
publish	0s
conclusion	1s
Coverage	15s
	24m 45s

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