Remove MinGW readdir/errno bug workaround fixed on 2003-10-10

Bruce Momjian <bruce@momjian.us>

Commit: 1494931d7375ccdc6afd34f135bc708f8954eecc
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-03-21T17:47:37Z
Releases: 9.4.0
Remove MinGW readdir/errno bug workaround fixed on 2003-10-10

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