This warning occurs a lot in make check. Nice if it could be removed.

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Aug 18, 2020, 2:00:08 PM8/18/20

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In file included from ../fflas-ffpack/fflas/fflas.h:102:

In file included from ../fflas-ffpack/fflas/fflas_freduce.h:30:

In file included from ../fflas-ffpack/fflas/fflas_simd.h:254:

../fflas-ffpack/fflas/fflas_simd/simd256.inl:95:9: warning: '_mm256_bslli_epi128' macro redefined [-Wmacro-redefined]

#define _mm256_bslli_epi128(a, count) _mm256_slli_si256((a), (count))

/usr/lib/llvm-10/lib/clang/10.0.0/include/avx2intrin.h:499:9: note: previous definition is here