[issue15102] Fix 64-bit building for buildbot scripts (issue 15102)

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset a9d4cf7d15b9 by Martin v. Löwis in branch 'default':
Issue #15102: Use HOST_PYTHON only if it is set.
http://hg.python.org/cpython/rev/a9d4cf7d15b9

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<http://bugs.python.org/issue15102>
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