[issue18407] Fix compiler warnings in pythoncore for Win64

[Jeremy Kloth]

Jeremy Kloth added the comment:

Added new patch that removes the duplicate changes from issue #15792 and comments the lone explicit cast.

These changes fix 116 of the 216 warnings (54%!) for Win64.  Together with issue #15792 brings the remaining count to 72.

I am unsure if splitting the changes further makes much sense as guidance I have received on IRC and as others have noted in various bug reports about "spamming" the tracker with issues per file.

With that and MvL's comment in issue #18295, I do not think that it is advisable to separate out changes for that issue.

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Added file: http://bugs.python.org/file30883/issue18407-2.diff

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<http://bugs.python.org/issue18407>
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