kernel32: In FindFirstFileExW(), call NtQueryDirectoryFile() again to determine if it read all files.

[Ken Thomases]

Previously, it only checked if the first call failed to fill the buffer.  This
is unreliable since the underlying implementation may be forced to return
a short buffer by the semantics of the system calls used.  In particular,
getdirentries() on Mac OS X can only read at the resolution of whole blocks
rather than individual directory entries for AFP-mounted volumes.
---
dlls/kernel32/file.c | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)

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