Add DESTDIR support to additional Python packages; upgrade pip to latest patch release

[embray]

These are packages for which the spkg-install requires more than just sdh_pip_install. See commit message for more details.

• numpy
• pillow
• pip
• setuptools

Also upgrades pip to the latest patch release (9.0.3) while we're at it.

Upstream tarball: https://pypi.python.org/packages/c4/44/e6b8056b6c8f2bfd1445cc9990f478930d8e3459e9dbf5b8e2d2922d64d3/pip-9.0.3.tar.gz

Component: build

Keywords: destdir cysignals pip setuptools pillow numpy

Author: Erik Bray

Branch/Commit: 5bdfd4e

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/25051

[saraedum]

Work Issues: merge conflicts

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

daaab8f

Update additional Python packages with DESTDIR support.

[sagetrac-git]

Changed commit from 293720c to daaab8f

[embray]

comment:5

Rebased.

---

New commits:

daaab8f

Update additional Python packages with DESTDIR support.

[jdemeyer]

Changed work issues from merge conflicts to none

[jdemeyer]

comment:7

For numpy, the "touching all includes" should be obsolete because of the changes to tarball extraction.