make the idle wheel code more readable #2813

Job	Run time
Build vendored (vendored-openssl,rustls-ring, g3proxy)	4m 33s
Build vendored (vendored-openssl,rustls-ring, g3bench)	2m 21s
Build vendored (vendored-openssl,rustls-ring, g3tiles)	2m 50s
Build vendored (vendored-tongsuo,rustls-ring, g3proxy)	3m 58s
Build vendored (vendored-tongsuo,rustls-ring, g3bench)	2m 9s
Build vendored (vendored-tongsuo,rustls-ring, g3tiles)	2m 22s
Build (stable)	5m 0s
Build vendored (vendored-boringssl,rustls-ring, g3proxy)	4m 42s
Build vendored (vendored-boringssl,rustls-ring, g3bench)	2m 53s
Build vendored (vendored-openssl, g3fcgen)	2m 15s
Build (beta)	5m 3s
Build vendored (vendored-boringssl,rustls-ring, g3tiles)	3m 16s
Build vendored (vendored-openssl, g3mkcert)	3m 6s
Build (nightly)	4m 43s
Build vendored (vendored-c-ares,rustls-ring, g3proxy)	3m 56s
Build vendored (vendored-openssl, g3keymess)	2m 20s
Build vendored (vendored-tongsuo, g3fcgen)	2m 7s
Clippy	1m 43s
Build vendored (vendored-tongsuo, g3mkcert)	1m 22s
Build vendored (vendored-tongsuo, g3keymess)	1m 50s
Build vendored (vendored-boringssl, g3fcgen)	2m 55s
Build vendored (vendored-boringssl, g3mkcert)	2m 20s
Build vendored (vendored-boringssl, g3keymess)	2m 48s
	1h 10m 32s

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