[issue15792] Fix compiler options for x64 builds on Windows

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7c46b1b239fe by Tim Golden in branch 'default':
Issue 15792 Correct build options on Win64. Patch by Jeremy Kloth.
http://hg.python.org/cpython/rev/7c46b1b239fe

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15792>
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