astropy 3.2.1 fails to build with python 3.8.3 with
errors similar to this:
astropy/stats/_stats.c:318:11: error: too many arguments to function 'PyCode_New'
PyCode_New(a, 0, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
These are files that are generated by cython, but are included in the
tarball. Since there's apparently been an API change to PyCode_New, they will
need to be re-cythonized to compile correctly.
99c46e8186