ntdll: Start of pooling support for RtlQueueWorkItem

[Robert Shearman]

This patch reduces the time taken to run the kernel QueueUserWorkItem 
test from 260ms to 6ms on my machine.

ChangeLog:
Start of pooling support for RtlQueueWorkItem. The algorithm
implmented is very simple - if there are no free threads, create a new
one.

  dlls/ntdll/threadpool.c |  137 
+++++++++++++++++++++++++++++++++++++++++++----
  1 files changed, 124 insertions(+), 13 deletions(-)

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