Added semaphore fail message when a semaphore cannot be opened.
Added semaphore fail message when a semaphore cannot be opened.

rbouqueau/libdtsc_xp,DDVTECH/mistserver,DDVTECH/mistserver,DDVTECH/mistserver,rbouqueau/libdtsc_xp,rbouqueau/libdtsc_xp,DDVTECH/mistserver,DDVTECH/mistserver