Clean up enumeration on macOS #483

Job	Run time
cargo-deny (advisories)	15s
lint	23s
cargo-deny (bans licenses sources)	19s
aarch64-apple-darwin / build	33s
aarch64-apple-darwin-nightly / build	25s
aarch64-apple-ios / build	21s
aarch64-unknown-linux-gnu / build	37s
aarch64-unknown-linux-musl / build	1m 6s
arm-linux-androideabi / build	27s
armv7-linux-androideabi / build	28s
i686-pc-windows-gnu / build	1m 38s
i686-pc-windows-msvc / build	2m 39s
i686-unknown-linux-gnu / build	38s
i686-unknown-linux-musl / build	1m 10s
msrv-aarch64-apple-darwin / build	44s
msrv-arm-linux-androideabi / build	51s
msrv-x86_64-pc-windows-msvc / build	48s
msrv-x86_64-unknown-freebsd / build	43s
msrv-x86_64-unknown-linux-musl / build	40s
msrv-x86_64-unknown-linux-gnu / build	26s
msrv-x86_64-unknown-netbsd / build	36s
x86_64-apple-darwin / build	37s
x86_64-pc-windows-msvc / build	1m 41s
x86_64-pc-windows-gnu / build	2m 9s
x86_64-pc-windows-msvc-nightly / build	1m 7s
x86_64-unknown-freebsd / build	25s
x86_64-unknown-linux-gnu / build	1m 2s
x86_64-unknown-linux-gnu-nightly / build	42s
x86_64-unknown-linux-musl / build	1m 0s
x86_64-unknown-netbsd / build	20s
	24m 50s

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