linux: support 'make linux26-nconfig'

Signed-off-by: Bjørn Forsman <bjorn.forsman@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

linux/linux.mk

@@ -159,7 +159,7 @@ $(LINUX26_DIR)/.stamp_installed: $(LINUX26_DIR)/.stamp_compiled
 
 linux26: host-module-init-tools $(LINUX26_DEPENDENCIES) $(LINUX26_DIR)/.stamp_installed
 
-linux26-menuconfig linux26-xconfig linux26-gconfig: dirs $(LINUX26_DIR)/.stamp_configured
+linux26-menuconfig linux26-xconfig linux26-gconfig linux26-nconfig: dirs $(LINUX26_DIR)/.stamp_configured
 	$(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) $(subst linux26-,,$@)
 
 # Support for rebuilding the kernel after the initramfs file list has