Add creation and access time fields to struct dirent

[dmik]

Struct dirent is already extended with some OS/2 specific file statistics information such as OS/2 attributes, size and date. It makes sense to also add the modification and last access date/time fields to this extension so that no separate stat() call is necessary at all when doing readdir(). This is in particular important on slow file systems with small caches and may significantly speed up the directory traversal in directories with thousands of files, when it is also necessary to gather statistics of these files rather than just enumerate them.

See ​http://svn.netlabs.org/qt4/ticket/176http://svn.netlabs.org/qt4/ticket/176 for more details on the topic.