Use a slice for the event list of kevent() #3902

Job	Run time
Check selected Tier 3 platforms (nightly)	2m 40s
Check --no-default-features (nightly)	56s
Check (stable)	4m 3s
Check nightly-only targets (nightly)	22s
Check (nightly)	4m 9s
Rustfmt	9s
Check (1.63)	7m 15s
Test (ubuntu)	45s
Test (ubuntu-20.04)	46s
Test use-libc (ubuntu)	44s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 7s
Test (i686-linux)	1m 2s
Test use-libc (i686-linux)	1m 9s
Test (aarch64-linux)	1m 15s
Test (powerpc64le-linux)	1m 3s
Test (riscv64-linux)	1m 6s
Test use-libc (aarch64-linux)	1m 3s
Test use-libc (powerpc64le-linux)	1m 3s
Test (s390x-linux)	1m 5s
Test use-libc (riscv64-linux)	58s
Test (arm-linux)	1m 6s
Test use-libc (arm-linux)	1m 6s
Test (ubuntu-stable)	45s
Test (i686-linux-stable)	2m 4s
Test (aarch64-linux-stable)	1m 9s
Test (riscv64-linux-stable)	1m 4s
Test (s390x-linux-stable)	1m 13s
Test (powerpc64le-linux-stable)	1m 18s
Test (arm-linux-stable)	1m 5s
Test (ubuntu-1.63)	1m 53s
Test (i686-linux-1.63)	2m 9s
Test (aarch64-linux-1.63)	2m 28s
Test (riscv64-linux-1.63)	2m 7s
Test (s390x-linux-1.63)	2m 16s
Test (powerpc64le-linux-1.63)	2m 15s
Test (arm-linux-1.63)	2m 14s
Test (macos-latest)	1m 42s
Test (macos-11)	2m 34s
Test (windows)	2m 2s
Test (windows-2019)	51s
Test (musl)	49s
	1h 6m 50s

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