qemu: filter out configure args with predefined macros

Reported-by: https://github.com/openwrt/packages/commit/a3033406eae94105b50ea9d57ea4a032b34a87a1#commitcomment-39321758
Suggested-by: Lucian Cristian <lucian.cristian@gmail.com>
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

utils/qemu/Makefile

@@ -276,8 +276,8 @@ CONFIGURE_ARGS:=$(filter-out	\
 	--program-prefix=%	\
 	--program-suffix=%	\
 	--exec-prefix=%		\
-	--disable-ipv6		\
-	--disable-nls		\
+	$(DISABLE_NLS)		\
+	$(DISABLE_IPV6)		\
 	, $(CONFIGURE_ARGS))
 
 # Tell build system of qemu to not add _FORTIFY_SOURCE options and let the base