message: Fix Makefile parallel builds missing protobuf header
diff: @@ -577,7 +577,7 @@ $(STATIC_NAME): $(OBJS) | $(LIB_BUILD_DIR)
  @ echo AR -o $@
  $(Q)ar rcs $@ $(OBJS)
  -$(BUILD_DIR)/%.o: %.cpp | $(ALL_BUILD_DIRS)
  +$(BUILD_DIR)/%.o: %.cpp $(PROTO_GEN_HEADER) | $(ALL_BUILD_DIRS)
  @ echo CXX $<
  $(Q)$(CXX) $< $(CXXFLAGS) -c -o $@ 2> $@.$(WARNS_EXT) \
  || (cat $@.$(WARNS_EXT); exit 1)
  