OS-1723 DTrace should speak JSON (review fixes)

@@ -47,10 +47,12 @@
 
 CERRWARN        += -_gcc=-Wno-parentheses
 CERRWARN        += -_gcc=-Wno-type-limits
 CERRWARN        += -_gcc=-Wno-uninitialized
 
+CPPFLAGS        += -I$(SRC)/common/util
+
 ALL_TARGET      = $(BINARY) $(SRC_CONFILE)
 LINT_TARGET     = $(MODULE).lint
 INSTALL_TARGET  = $(BINARY) $(ROOTMODULE) $(ROOT_CONFFILE)
 AS_INC_PATH     += -I$(DSF_DIR)/$(OBJS_DIR)