Fix AVX detection #158

Job	Run time
makefile-analysis	1m 25s
cmake-alpine-amd64-gcc	16s
makefile-alpine-amd64-gcc	21s
cmake-alpine-armv7-gcc	1m 6s
makefile-alpine-armv7-gcc	1m 6s
cmake-alpine-armv7-clang	2m 15s
makefile-alpine-armv7-clang	1m 55s
cmake-ubuntu-20.04-x86_64	5s
makefile-alpine-aarch64-gcc	1m 53s
cmake-alpine-aarch64-gcc	1m 45s
makefile-ubuntu-20.04-amd64-gcc	5s
cmake-ubuntu-20.04-i686	30s
cmake-alpine-aarch64-clang	4m 16s
makefile-alpine-aarch64-clang	2m 1s
makefile-ubuntu-20.04-amd64-gcc +openmp	22s
cmake-macos-11-x86_64	18s
cmake-alpine-s390x-gcc	2m 6s
makefile-alpine-s390x-gcc	1m 52s
makefile-ubuntu-20.04-amd64-clang	5s
cmake-windows-2019-x86_64	1m 8s
cmake-alpine-s390x-clang	1m 46s
makefile-alpine-s390x-clang	1m 30s
makefile-ubuntu-20.04-amd64-clang +openmp	14s
cmake-windows-2019-i686	1m 2s
cmake-alpine-ppc64le-gcc	1m 12s
makefile-alpine-ppc64le-gcc	1m 49s
makefile-macos-11-amd64-clang	19s
cmake-alpine-ppc64le-clang	2m 10s
makefile-alpine-ppc64le-clang	1m 25s
	36m 17s

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