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This reverts commit 5aabb679.

Leo Pound Singer authored Nov 01, 2019 and Leo Pound Singer committed Nov 13, 2019

This reverts commit 405d011b

This reverts commit 84f31caf.

Leo Pound Singer authored Nov 01, 2019 and Leo Pound Singer committed Nov 01, 2019

So that we can use the `checkout_output` keyword argument that was
added `subprocess.run()` in Python 3.7.

Pip leaves behind directories with names starting with `~` in the
site-packages directory due to a bug that occurs when uninstalling
packages from an NFS filesystem.

See https://github.com/pypa/pip/issues/6327.

Fixes #206.

This reverts commit 0de70d98.

This reverts commit ae9057bb.

See #193.

GitLab does not necessarily clean out the build directory prior to
the start of a job.