Clean up enumeration on macOS #492

Job	Run time
cargo-deny (advisories)	16s
lint	21s
cargo-deny (bans licenses sources)	16s
aarch64-apple-darwin / build	32s
aarch64-apple-ios / build	22s
aarch64-apple-darwin-nightly / build	28s
aarch64-unknown-linux-gnu / build	44s
aarch64-unknown-linux-musl / build	52s
arm-linux-androideabi / build	23s
armv7-linux-androideabi / build	26s
i686-pc-windows-gnu / build	2m 25s
i686-pc-windows-msvc / build	2m 48s
i686-unknown-linux-musl / build	1m 6s
i686-unknown-linux-gnu / build	44s
msrv-aarch64-apple-darwin / build	32s
msrv-arm-linux-androideabi / build	34s
msrv-x86_64-pc-windows-msvc / build	41s
msrv-x86_64-unknown-freebsd / build	32s
msrv-x86_64-unknown-linux-gnu / build	34s
msrv-x86_64-unknown-linux-musl / build	55s
msrv-x86_64-unknown-netbsd / build	30s
x86_64-apple-darwin / build	35s
x86_64-pc-windows-gnu / build	2m 12s
x86_64-pc-windows-msvc / build	2m 9s
x86_64-pc-windows-msvc-nightly / build	1m 8s
x86_64-unknown-freebsd / build	22s
x86_64-unknown-linux-gnu / build	1m 14s
x86_64-unknown-linux-gnu-nightly / build	36s
x86_64-unknown-linux-musl / build	56s
x86_64-unknown-netbsd / build	28s
	25m 41s

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