ntdll: Use lockfree implementation for get_cached_fd. (resend)

[Sebastian Lackner]

Contains a couple of small improvements compared with the last attempt. As a reminder, the #ifdefs are there because we do not have 64-bit interlocked instructions on PowerPC (and I have also no idea if its possible at all to implement them properly).

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 dlls/ntdll/server.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 66 insertions(+), 1 deletion(-)
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