[1/3] ntdll: Use lockfree implementation for get_cached_fd. (try 2)

[Sebastian Lackner]

v2: Avoid #ifdefs and simplify code a bit. On PowerPC all interlocked operations will use
interlocked_cmpxchg64, which means that we can implement it using a pthread lock.

---
 dlls/ntdll/server.c | 105 ++++++++++++++++++++++++++++++++++------------------
 1 file changed, 68 insertions(+), 37 deletions(-)
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