Fix some TODOs in the CI rules. #4192

Job	Run time
Check (stable)	2m 37s
Check (nightly)	2m 45s
Check nightly-only targets (nightly)	23s
Check (1.63)	2m 42s
Check selected Tier 3 platforms (nightly)	4m 31s
Check --no-default-features (nightly)	54s
Rustfmt	7s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 3s
Test (ubuntu)	41s
Test (ubuntu-20.04)	40s
Test use-libc (ubuntu)	43s
Test use-libc (i686-linux)	55s
Test (i686-linux)	59s
Test use-libc (aarch64-linux)	58s
Test (aarch64-linux)	1m 18s
Test use-libc (powerpc64le-linux)	1m 29s
Test (powerpc64le-linux)	1m 15s
Test use-libc (riscv64-linux)	1m 2s
Test (riscv64-linux)	1m 35s
Test use-libc (arm-linux)	1m 8s
Test (s390x-linux)	1m 11s
Test (arm-linux)	1m 1s
Test (ubuntu-stable)	37s
Test (i686-linux-stable)	1m 9s
Test (aarch64-linux-stable)	58s
Test (riscv64-linux-stable)	59s
Test (s390x-linux-stable)	1m 6s
Test (powerpc64le-linux-stable)	1m 2s
Test (arm-linux-stable)	1m 14s
Test (ubuntu-1.63)	3m 36s
Test (i686-linux-1.63)	3m 47s
Test (aarch64-linux-1.63)	4m 10s
Test (riscv64-linux-1.63)	4m 15s
Test (s390x-linux-1.63)	3m 53s
Test (powerpc64le-linux-1.63)	3m 50s
Test (arm-linux-1.63)	4m 0s
Test (macos-latest)	17m 45s
Test (macos-12)	19m 23s
Test (windows)	49s
Test (windows-2019)	47s
Test (musl)	41s
	1h 43m 58s

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