Modernize epoll API #4143

Job	Run time
Check nightly-only targets (nightly)	21s
Check selected Tier 3 platforms (nightly)	2m 25s
Check --no-default-features (nightly)	55s
Check (stable)	4m 4s
Rustfmt	6s
Check (nightly)	4m 9s
Check (1.63)	7m 55s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 4s
Test (ubuntu)	42s
Test use-libc (ubuntu)	35s
Test (ubuntu-20.04)	44s
Test use-libc (i686-linux)	1m 7s
Test (i686-linux)	1m 7s
Test (aarch64-linux)	1m 5s
Test use-libc (aarch64-linux)	1m 3s
Test (powerpc64le-linux)	1m 3s
Test use-libc (powerpc64le-linux)	1m 29s
Test (riscv64-linux)	1m 9s
Test use-libc (riscv64-linux)	1m 6s
Test (s390x-linux)	1m 7s
Test use-libc (arm-linux)	1m 10s
Test (arm-linux)	1m 12s
Test (ubuntu-stable)	40s
Test (i686-linux-stable)	1m 0s
Test (aarch64-linux-stable)	1m 3s
Test (riscv64-linux-stable)	1m 20s
Test (s390x-linux-stable)	1m 11s
Test (powerpc64le-linux-stable)	1m 5s
Test (arm-linux-stable)	1m 15s
Test (ubuntu-1.63)	3m 15s
Test (i686-linux-1.63)	4m 7s
Test (aarch64-linux-1.63)	3m 45s
Test (riscv64-linux-1.63)	3m 38s
Test (s390x-linux-1.63)	3m 35s
Test (powerpc64le-linux-1.63)	3m 35s
Test (arm-linux-1.63)	3m 48s
Test (macos-latest)	17m 50s
Test (macos-12)	18m 23s
Test (windows)	41s
Test (windows-2019)	48s
Test (musl)	40s
	1h 47m 17s

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