build scripts: fix 'make defconfig' damage

Looking at the target 'defconfig' in include/toplevel, it doesn't
directly reference $(HOME)/.openwrt/defconfig nor does it reference any
prerequisites using it as a target.

Therefore, building "defconfig" as a target uses the defaults in the
tree, but not the defaults that a user might have explicitly specified.

This patch fixes this regression from r36361.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
[florian: apply with the proper patch level, wrap at 80 columns]
Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37883 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/toplevel.mk

@@ -89,6 +89,7 @@ config-clean: FORCE
 
 defconfig: scripts/config/conf prepare-tmpinfo FORCE
 	touch .config
+	@if [ -e $(HOME)/.openwrt/defconfig ]; then cp $(HOME)/.openwrt/defconfig .config; fi
 	$< --defconfig=.config Config.in
 
 confdefault-y=allyes
@@ -152,7 +153,7 @@ prereq:: prepare-tmpinfo .config
 	@+$(PREP_MK) $(NO_TRACE_MAKE) -r -s prereq
 	@( \
 		cp .config tmp/.config; \
-		./scripts/config/conf --defconfig tmp/.config -w tmp/.config Config.in > /dev/null 2>&1; \
+		./scripts/config/conf --defconfig=tmp/.config -w tmp/.config Config.in > /dev/null 2>&1; \
 		if ./scripts/kconfig.pl '>' .config tmp/.config | grep -q CONFIG; then \
 			printf "$(_R)WARNING: your configuration is out of sync. Please run make menuconfig, oldconfig or defconfig!$(_N)\n" >&2; \
 		fi \