Compilation error on OSX ARM64

[martin-g]

Hi!

#78 broke the build for OSX ARM64 due to the inclusion of -mno-avx to the compiler options and this option is available only for x86_64.

ERR) arm64-apple-darwin20.0: arm64-apple-darwin20.0: error: unsupported option '-mno-avx2' for target 'arm64-apple-darwin20.0.0'�[0m
22:39:20 �[32mBIOCONDA INFO�[0m (ERR) error: unsupported option '-mno-avx2' for target 'arm64-apple-darwin20.0.0

bioconda/bioconda-recipes#52846