[CMake] Updated FindThreads.cmake in tracker

[Philip Lowman]

Hello,

I've merged (optional) Pthreads-win32 support into a FindThreads.cmake
attached in the tracker and added some documentation on how to use it.
Since FindThreads isn't my module I wanted to throw this up on the mailing
list for feedback.

http://www.cmake.org/Bug/view.php?id=6399


Also, in regard to a previous mailing list thread about FindThreads...

I'm not sure which platform the block "Check if compiler accepts -pthread"
is executed on.  The documentation I attached to the code advises calling
"target_link_libraries(target ${CMAKE_THREAD_LIBS_INIT})".  After grokking
the code a bit further I'm now guessing this "-pthread" argument is
technically accepted by the linker and not needed by the compiler, but it
would be nice to know this for sure to ensure the documentation is correct.

-- 
Philip Lowman
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