Re-enable AVX2 convolutional decoder #837

Job	Run time
build-macos	1m 11s
Build on ubuntu-20.04 g++-7	1m 5s
Build on ubuntu-20.04 g++-8	1m 0s
Build on ubuntu-latest g++-9	58s
Build on ubuntu20.04 aarch64 g++-8	7m 5s
Build on ubuntu-latest g++-10	1m 29s
Build on ubuntu20.04 aarch64 g++-9	7m 33s
Build on ubuntu-20.04 clang-7	51s
Build on ubuntu20.04 aarch64 g++-10	6m 43s
Build on ubuntu-20.04 clang-8	1m 19s
Build on ubuntu22.04 aarch64 g++-12	6m 46s
Build on ubuntu-20.04 clang-9	1m 0s
Build on ubuntu20.04 aarch64 clang-9	10m 15s
Build on ubuntu-20.04 clang-10	1m 38s
Build on ubuntu20.04 aarch64 clang-10	10m 33s
Build on ubuntu-20.04 clang-11	54s
Build on ubuntu22.04 aarch64 clang-14	9m 55s
Build on ubuntu22.04 armv7 g++	6m 35s
Build on ubuntu-latest clang-12	1m 3s
Build on ubuntu22.04 ppc64le g++-12	6m 19s
Build on ubuntu-latest clang-13	56s
Build on ubuntu22.04 s390x g++-12	6m 7s
Build on ubuntu-latest clang-14	55s
Build on ubuntu22.04 riscv64 g++-12	5m 45s
Build static on ubuntu-latest	1m 6s
build-windows	2m 35s
	1h 41m 36s

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