bpf: Add `bpf_strncmp` helper #2216

Job	Run time
lint	1m 28s
build-test-aya (x86_64-unknown-linux-gnu)	1m 57s
build-test-aya-ebpf (x86_64, bpfel-unknown-none)	28s
run-integration-test (x86_64-apple-darwin, macos-13)	12m 15s
build-test-aya (aarch64-unknown-linux-gnu)	4m 25s
build-test-aya-ebpf (x86_64, bpfeb-unknown-none)	28s
build-test-aya (armv7-unknown-linux-gnueabi)	3m 57s
run-integration-test (x86_64-unknown-linux-gnu, ubuntu-22.04)	3m 45s
build-test-aya-ebpf (aarch64, bpfel-unknown-none)	33s
build-test-aya (riscv64gc-unknown-linux-gnu)	3m 44s
build-test-aya-ebpf (aarch64, bpfeb-unknown-none)	34s
build-test-aya (powerpc64le-unknown-linux-gnu)	4m 2s
build-test-aya-ebpf (arm, bpfel-unknown-none)	33s
build-test-aya (s390x-unknown-linux-gnu)	4m 4s
build-test-aya-ebpf (arm, bpfeb-unknown-none)	30s
build-test-aya-ebpf (riscv64, bpfel-unknown-none)	28s
build-test-aya-ebpf (riscv64, bpfeb-unknown-none)	34s
build-test-aya-ebpf (powerpc64, bpfel-unknown-none)	30s
build-test-aya-ebpf (powerpc64, bpfeb-unknown-none)	30s
build-test-aya-ebpf (s390x, bpfel-unknown-none)	30s
build-test-aya-ebpf (s390x, bpfeb-unknown-none)	37s
build-workflow-complete	0s
	45m 52s

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