6079 libdisasm doesn't enable C99MODE properly

*** 133,140 ****
--- 133,142 ----
  CFLAGS += $(CFLAGS_$(CURTYPE)) $(CFLAGS_common)
  
  CFLAGS64_standalone = $(STAND_FLAGS_64)
  CFLAGS64 += $(CCVERBOSE) $(CFLAGS64_$(CURTYPE)) $(CFLAGS64_common)
  
+ C99MODE = $(C99_ENABLE)
+ 
  DYNFLAGS +=     $(ZINTERPOSE)
  
  .KEEP_STATE: