6079 libdisasm doesn't enable C99MODE properly

@@ -133,8 +133,10 @@
 CFLAGS += $(CFLAGS_$(CURTYPE)) $(CFLAGS_common)
 
 CFLAGS64_standalone = $(STAND_FLAGS_64)
 CFLAGS64 += $(CCVERBOSE) $(CFLAGS64_$(CURTYPE)) $(CFLAGS64_common)
 
+C99MODE = $(C99_ENABLE)
+
 DYNFLAGS +=     $(ZINTERPOSE)
 
 .KEEP_STATE: