[issue18637] mingw: export _PyNode_SizeOf as PyAPI for parser module

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM.

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assignee:  -> serhiy.storchaka
nosy: +serhiy.storchaka
stage:  -> commit review
type: enhancement -> behavior
versions: +Python 2.7, Python 3.5

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<http://bugs.python.org/issue18637>
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