ntdll: fix read_directory_getdirentries() under FreeBSD.

[David Naylor]

Change the handling of getdirentries(2) by:
 - tracking the data pointer instead of subtracting 'res'
 - simplify rewind by skipping re-appending entries onto the list
 - try make the logic easier to follow
---
 dlls/ntdll/directory.c | 73 
+++++++++++++++++++-------------------------------
 1 file changed, 28 insertions(+), 45 deletions(-)
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