MAINT: be more tolerant of setuptools>=60
MAINT: be more tolerant of setuptools>=60

NumPy may fail to build with the default vendored distutils in
setuptools>=60. Rather than panic and die when new setuptools is found,
let's check (or set, if possible) the SETUPTOOLS_USE_DISTUTILS
environment variable that restores "proper" setuptools behavior.

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