* include/threads.h,include/threads_funcs.h: reverted Win32 pthread implementation to
the old code. Fixed vlc_cond_broadcast() for WinNT/2K/XP. Additional vlc_cond_*
implementations for Win9x.
* src/interface/main.c: renamed --fast_pthread option into --fast-mutex. Added a
--win9x-cv-method option to choose which vlc_cond_* implementation we want on Win9x.