[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 c56783fe2e3b by Stefan Krah in branch 'default':
Issue #15102: Fix paths in external-amd64.bat.
http://hg.python.org/cpython/rev/c56783fe2e3b

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15102>
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