Use a slice for the event list of kevent() #3904

Job	Run time
Check (stable)	4m 30s
Check nightly-only targets (nightly)	25s
Check (nightly)	4m 8s
Check selected Tier 3 platforms (nightly)	2m 45s
Check (1.63)	6m 31s
Check --no-default-features (nightly)	51s
Rustfmt	7s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 14s
Test use-libc (ubuntu)	45s
Test use-libc (i686-linux)	56s
Test use-libc (aarch64-linux)	1m 9s
Test (ubuntu)	44s
Test use-libc (powerpc64le-linux)	1m 2s
Test (ubuntu-20.04)	47s
Test use-libc (riscv64-linux)	1m 0s
Test (i686-linux)	1m 0s
Test use-libc (arm-linux)	1m 5s
Test (aarch64-linux)	1m 29s
Test (powerpc64le-linux)	1m 22s
Test (riscv64-linux)	1m 15s
Test (s390x-linux)	1m 13s
Test (arm-linux)	1m 5s
Test (ubuntu-stable)	48s
Test (i686-linux-stable)	1m 28s
Test (aarch64-linux-stable)	59s
Test (riscv64-linux-stable)	1m 20s
Test (s390x-linux-stable)	1m 10s
Test (powerpc64le-linux-stable)	1m 4s
Test (arm-linux-stable)	59s
Test (ubuntu-1.63)	1m 50s
Test (i686-linux-1.63)	2m 7s
Test (aarch64-linux-1.63)	3m 44s
Test (riscv64-linux-1.63)	2m 27s
Test (s390x-linux-1.63)	2m 4s
Test (powerpc64le-linux-1.63)	2m 13s
Test (arm-linux-1.63)	2m 37s
Test (macos-latest)	18m 43s
Test (macos-11)	5m 25s
Test (windows)	56s
Test (windows-2019)	54s
Test (musl)	47s
	1h 26m 58s

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