ntdll: Work around a bug in Mac OS X's getdirentries().

[Ken Thomases]

For some file systems, it resets the fd's file position to 0 when it exhausts
the directory entries.
---
  dlls/ntdll/directory.c |   24 ++++++++++++++++++++++--
  1 files changed, 22 insertions(+), 2 deletions(-)
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