Enable a few features on more platforms. #4416

Job	Run time
Rustfmt	11s
Check --no-default-features (nightly)	55s
Check nightly-only targets (nightly)	23s
Check (stable)	6m 2s
Check selected Tier 3 platforms (nightly)	5m 4s
Check (nightly)	6m 19s
Check (1.63)	10m 17s
Test use-libc (ubuntu)	44s
Test use-libc (i686-linux)	1m 1s
Test (ubuntu)	43s
Test use-libc (aarch64-linux)	1m 3s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 33s
Test (ubuntu-20.04)	47s
Test use-libc (powerpc64le-linux)	1m 31s
Test rustix_use_experimental_asm (s390x-linux)	1m 4s
Test use-libc (riscv64-linux)	1m 24s
Test (i686-linux)	59s
Test (aarch64-linux)	1m 11s
Test use-libc (s390x-linux)	1m 7s
Test (powerpc64le-linux)	1m 14s
Test use-libc (arm-linux)	1m 6s
Test (riscv64-linux)	1m 0s
Test (s390x-linux)	1m 4s
Test (arm-linux)	1m 6s
Test (ubuntu-stable)	47s
Test (i686-linux-stable)	1m 0s
Test (aarch64-linux-stable)	1m 28s
Test (riscv64-linux-stable)	1m 6s
Test (s390x-linux-stable)	1m 0s
Test (powerpc64le-linux-stable)	58s
Test (arm-linux-stable)	1m 3s
Test (ubuntu-1.63)	2m 16s
Test (i686-linux-1.63)	2m 30s
Test (aarch64-linux-1.63)	2m 32s
Test (riscv64-linux-1.63)	2m 45s
Test (s390x-linux-1.63)	3m 7s
Test (powerpc64le-linux-1.63)	3m 7s
Test (arm-linux-1.63)	3m 6s
Test (macos-latest)	33s
Test (macos-12)	54s
Test (windows)	47s
Test (windows-2019)	55s
Test (musl)	47s
	1h 18m 29s

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