builddist: update to create petsc4py tarball
Requisites:
$ pip2 list --user
Package Version
-------- -------
Cython 0.29.22
docutils 0.16
epydoc 3.0.1
numpy 1.16.6
yum install python2-setuptools python3-sphinx
Requisites:
$ pip2 list --user
Package Version
-------- -------
Cython 0.29.22
docutils 0.16
epydoc 3.0.1
numpy 1.16.6
yum install python2-setuptools python3-sphinx