[AC21.5, R21.4] Revert workaround missing d_ino field from 'struct dirent' for Cygwin patch

[Aidan Kehoe]

APPROVE COMMIT 21.5, RECOMMEND 21.4. 

NOTE: This patch has been committed.

Thank you Volker!

 Ar an triochadú lá de mí na Samhain, scríobh Dr. Volker Zell: 

 > 2006-11-29  Dr. Volker Zell  <Dr.Volker.Zell at oracle.com>
 > 
 > 	* sysdir.h: Revert workaround missing d_ino field from 'struct dirent'
 > 	for Cygwin as it's back in again.
 >
 > [...]

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