This reverts commit 8b3532c562.
The change mentioned inline has been incoporated upstream with [1]. I
don't think we've managed to replicate the corrupt wheel situation
since.
[1] https://github.com/pypa/pip/commit/0dbab23df903926de71b8e2ce08359a378327ad1
Change-Id: I58fa0a53939207427f286584e91e1c59d4863992
Run the build scripts on the wheel mirror builders