Small simplifications #3275

Job	Run time
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	24s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	26s
features_check (ubuntu-latest)	5m 45s
alternative_targets (ubuntu-latest, aarch64-linux-android)	20s
no_std (ubuntu-latest, thumbv6m-none-eabi)	19s
rust_msrv (ubuntu-latest)	1m 34s
rust_versions (ubuntu-latest, stable)	1m 14s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	21s
timezones (ubuntu-latest, ACST-9:30)	1m 32s
rust_versions (ubuntu-latest, beta)	1m 16s
timezones (ubuntu-latest, EST4)	1m 34s
timezones (ubuntu-latest, UTC0)	1m 35s
rust_versions (ubuntu-latest, nightly)	1m 31s
timezones (ubuntu-latest, Asia/Katmandu)	1m 28s
timezones (macos-latest, ACST-9:30)	1m 20s
timezones (macos-latest, EST4)	1m 4s
check-docs	27s
timezones (macos-latest, UTC0)	1m 19s
timezones (macos-latest, Asia/Katmandu)	2m 8s
cross-targets (x86_64-unknown-illumos)	1m 16s
timezones (windows-latest, ACST-9:30)	2m 8s
timezones (windows-latest, EST4)	3m 37s
cross-tests (ubuntu-latest)	2m 13s
timezones (windows-latest, UTC0)	3m 20s
timezones (windows-latest, Asia/Katmandu)	2m 22s
test_wasi (ubuntu-latest, wasm32-wasi)	30s
test_wasm (ubuntu-latest)	34s
	41m 37s

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