[issue42336] Make PCbuild/build.bat build x64 by default

[Steve Dower]

Change by Steve Dower <steve.dower at python.org>:


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pull_requests: +22215
pull_request: https://github.com/python/cpython/pull/23325

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42336>
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