use target cflags

package/udhcp/udhcp.mk

@@ -32,6 +32,7 @@ udhcp-source: $(DL_DIR)/$(UDHCP_SOURCE)
 
 $(UDHCP_DIR)/.unpacked: $(DL_DIR)/$(UDHCP_SOURCE)
 	zcat $(DL_DIR)/$(UDHCP_SOURCE) | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
+	$(SED) 's/-Os -fomit-frame-pointer/$(TARGET_CFLAGS)/' $(UDHCP_DIR)/Makefile
 	touch $(UDHCP_DIR)/.unpacked
 
 #$(UDHCP_DIR)/.unpacked: