Remove obsolete weird feature guard #3425

Job	Run time
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	28s
check-docs	20s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	16s
cross-targets (x86_64-unknown-illumos)	1m 10s
alternative_targets (ubuntu-latest, aarch64-linux-android)	23s
cross-tests (ubuntu-latest)	2m 8s
features_check (ubuntu-latest)	3m 55s
no_std (ubuntu-latest, thumbv6m-none-eabi)	12s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	17s
rust_versions (ubuntu-latest, stable)	1m 8s
test_wasi (ubuntu-latest, wasm32-wasi)	28s
rust_versions (ubuntu-latest, beta)	1m 12s
rust_msrv (ubuntu-latest)	2m 14s
rust_versions (ubuntu-latest, nightly)	1m 6s
test_wasm (ubuntu-latest)	43s
timezones (ubuntu-latest, ACST-9:30)	1m 33s
timezones (ubuntu-latest, EST4)	1m 26s
timezones (ubuntu-latest, UTC0)	1m 28s
timezones (ubuntu-latest, Asia/Katmandu)	1m 27s
timezones (macos-latest, ACST-9:30)	51s
timezones (macos-latest, EST4)	41s
timezones (macos-latest, UTC0)	38s
timezones (macos-latest, Asia/Katmandu)	47s
timezones (windows-latest, ACST-9:30)	2m 17s
timezones (windows-latest, EST4)	1m 48s
timezones (windows-latest, UTC0)	2m 13s
timezones (windows-latest, Asia/Katmandu)	2m 35s
	33m 44s

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