remove buggy and slow neonv8 kernel #723

Job	Run time
build-windows	3m 26s
build-macos	1m 19s
Build on ubuntu-20.04 g++-7	2m 16s
Build on ubuntu-20.04 g++-8	2m 15s
Build on ubuntu20.04 aarch64 g++-8	13m 22s
Build on ubuntu-latest g++-9	3m 8s
Build on ubuntu20.04 aarch64 g++-9	12m 15s
Build on ubuntu-latest g++-10	3m 13s
Build on ubuntu20.04 aarch64 g++-10	13m 40s
Build on ubuntu-20.04 clang-7	2m 43s
Build on ubuntu-20.04 clang-8	2m 14s
Build on ubuntu22.04 aarch64 g++-12	12m 23s
Build on ubuntu20.04 aarch64 clang-9	20m 54s
Build on ubuntu-20.04 clang-9	2m 26s
Build on ubuntu20.04 aarch64 clang-10	23m 14s
Build on ubuntu-20.04 clang-10	2m 10s
Build on ubuntu22.04 aarch64 clang-14	16m 28s
Build on ubuntu-20.04 clang-11	2m 8s
Build on ubuntu22.04 armv7 g++-12	10m 7s
Build on ubuntu-latest clang-12	2m 17s
Build on ubuntu-latest clang-13	2m 34s
Build on ubuntu-latest clang-14	3m 43s
Build on ubuntu22.04 ppc64le g++-12	13m 13s
Build on ubuntu22.04 s390x g++-12	9m 24s
Build on ubuntu22.04 riscv64 g++-12	8m 28s
Build static on ubuntu-latest	2m 46s
	3h 12m 6s

Provide feedback