Use platform name in openblas_support and add macosx-arm64 support
Use platform name in openblas_support and add macosx-arm64 support

instead of mixing OS name and architecture into arch variable

rgommers/numpy,jakirkham/numpy,pbrod/numpy,endolith/numpy,rgommers/numpy,mhvk/numpy,anntzer/numpy,mhvk/numpy,simongibbons/numpy,jakirkham/numpy,seberg/numpy,madphysicist/numpy,mhvk/numpy,simongibbons/numpy,charris/numpy,rgommers/numpy,mattip/numpy,pbrod/numpy,numpy/numpy,anntzer/numpy,charris/numpy,madphysicist/numpy,charris/numpy,pbrod/numpy,endolith/numpy,pdebuyl/numpy,numpy/numpy,madphysicist/numpy,jakirkham/numpy,pdebuyl/numpy,mattip/numpy,anntzer/numpy,pbrod/numpy,simongibbons/numpy,jakirkham/numpy,endolith/numpy,numpy/numpy,numpy/numpy,mhvk/numpy,anntzer/numpy,mhvk/numpy,jakirkham/numpy,seberg/numpy,simongibbons/numpy,charris/numpy,mattip/numpy,seberg/numpy,mattip/numpy,seberg/numpy,pdebuyl/numpy,madphysicist/numpy,madphysicist/numpy,endolith/numpy,simongibbons/numpy,pbrod/numpy,rgommers/numpy,pdebuyl/numpy