ntdll/tests: Add tests for TpSimpleTryPost function. (try 2)

[Sebastian Lackner]

Uses a semaphore instead of the busy-looping.

The Sleep at the end was also removed, but there is a high risk of race-conditions in the threading implementation of Wine, which can lead to wrong exit codes from time to time (of course only after the Tp* functions are implemented). The race-condition is fixed with http://source.winehq.org/patches/data/109498.

---
 dlls/ntdll/tests/Makefile.in  |   1 +
 dlls/ntdll/tests/threadpool.c | 127 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 128 insertions(+)
 create mode 100644 dlls/ntdll/tests/threadpool.c
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