fix multi IL_NO_WDP define (use one in config.h)
fix multi IL_NO_WDP define (use one in config.h)

bcampbell/DevIL,DentonW/DevIL,Agadoul/DevIL,bcampbell/DevIL,bcampbell/DevIL,Agadoul/DevIL,Agadoul/DevIL,Agadoul/DevIL,DentonW/DevIL,bcampbell/DevIL,bcampbell/DevIL,Agadoul/DevIL,DentonW/DevIL,bcampbell/DevIL,DentonW/DevIL,Agadoul/DevIL,DentonW/DevIL,DentonW/DevIL