Enable a few features on more platforms. #4415

Job	Run time
Check selected Tier 3 platforms (nightly)	4m 29s
Check --no-default-features (nightly)	56s
Check (stable)	5m 46s
Check nightly-only targets (nightly)	25s
Check (nightly)	5m 52s
Rustfmt	13s
Check (1.63)	5m 52s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 8s
Test (ubuntu)	44s
Test rustix_use_experimental_asm (s390x-linux)	1m 7s
Test (ubuntu-20.04)	44s
Test use-libc (ubuntu)	43s
Test (i686-linux)	1m 1s
Test use-libc (i686-linux)	59s
Test (aarch64-linux)	1m 9s
Test use-libc (aarch64-linux)	1m 3s
Test use-libc (powerpc64le-linux)	1m 6s
Test (powerpc64le-linux)	1m 8s
Test use-libc (riscv64-linux)	1m 3s
Test (riscv64-linux)	56s
Test use-libc (s390x-linux)	1m 3s
Test (s390x-linux)	1m 5s
Test use-libc (arm-linux)	1m 6s
Test (arm-linux)	1m 7s
Test (ubuntu-stable)	48s
Test (i686-linux-stable)	1m 2s
Test (aarch64-linux-stable)	1m 6s
Test (riscv64-linux-stable)	1m 3s
Test (s390x-linux-stable)	1m 0s
Test (powerpc64le-linux-stable)	1m 14s
Test (arm-linux-stable)	1m 5s
Test (ubuntu-1.63)	2m 11s
Test (i686-linux-1.63)	2m 31s
Test (aarch64-linux-1.63)	2m 37s
Test (riscv64-linux-1.63)	2m 45s
Test (s390x-linux-1.63)	2m 45s
Test (powerpc64le-linux-1.63)	2m 32s
Test (arm-linux-1.63)	2m 40s
Test (macos-latest)	29s
Test (macos-12)	51s
Test (windows)	58s
Test (windows-2019)	58s
Test (musl)	46s
	1h 10m 6s

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