binutils needs a CONFIG_UPDATE too, noted by Mike Frysinger.

toolchain/binutils/binutils.mk

@@ -38,6 +38,7 @@ $(DL_DIR)/$(BINUTILS_SOURCE):
 $(BINUTILS_DIR)/.unpacked: $(DL_DIR)/$(BINUTILS_SOURCE)
 	mkdir -p $(TOOL_BUILD_DIR)
 	$(BINUTILS_CAT) $(DL_DIR)/$(BINUTILS_SOURCE) | tar -C $(TOOL_BUILD_DIR) $(TAR_OPTIONS) -
+	$(CONFIG_UPDATE) $(BINUTILS_DIR)
 	touch $(BINUTILS_DIR)/.unpacked
 
 $(BINUTILS_DIR)/.patched: $(BINUTILS_DIR)/.unpacked