[issue20568] Pass --default-install to ensurepip in the Windows installers

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5d190cca2f47 by Nick Coghlan in branch '3.4':
Close #20568: install unversioned pip command on Windows
http://hg.python.org/cpython/rev/5d190cca2f47

New changeset 3f8ca67bde4d by Martin v. Löwis in branch '3.4':
Issue #20568: Fix typo in pip option.
http://hg.python.org/cpython/rev/3f8ca67bde4d

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