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

[Roundup Robot]

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

New changeset 6abab1a103a6 by Victor Stinner in branch 'default':
Issue #14744: Fix compilation on Windows
http://hg.python.org/cpython/rev/6abab1a103a6

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