* include/vlc_threads.h,include/main.h,src/misc/threads.c,src/misc/win32_specific.c:

* include/vlc_threads.h,include/main.h,src/misc/threads.c,src/misc/win32_specific.c:
reverted Win32 pthread implementation to the old code. Fixed vlc_cond_broadcast() for
WinNT/2K/XP. Additional vlc_cond_* implementations for Win9x.
* src/libvlc.h: renamed --fast_pthread option into --fast-mutex. Added a
--win9x-cv-method option to choose which vlc_cond_* implementation we want on Win9x.