[issue22103] bdist_wininst does not run install script

[Cybjit]

Cybjit added the comment:

3f7d5c235d82 runs script, 70ea05f762a1 does not.

0c8f41ca9c94 + t.patch from #21354 does not run script.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22103>
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