Remove LPTHREAD_START_ROUTINE Casts

[Robert Shearman]

Hi,

There is no legitimate reason to need use a type cast when passing in 
the thread start routine to CreateThread. At least one of the functions 
in this patch would have resulted in undefined behaviour from pretending 
that the thread function return void instead of DWORD. Many of the other 
functions would have resulted in a trashed stack if the functions they 
didn't use ExitThread.

Changelog:
Fix broken thread start routines.
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