[issue14744] Use _PyUnicodeWriter API in str.format() internals

[Roundup Robot]

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

New changeset df0144f68d76 by Victor Stinner in branch 'default':
Issue #14744: Fix compilation on Windows (part 2)
http://hg.python.org/cpython/rev/df0144f68d76

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<http://bugs.python.org/issue14744>
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