qemu: ignore configure option --disable-ipv6

Fixes: https://github.com/openwrt/packages/issues/12194
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

utils/qemu/Makefile

@@ -276,6 +276,7 @@ CONFIGURE_ARGS:=$(filter-out	\
 	--program-prefix=%	\
 	--program-suffix=%	\
 	--exec-prefix=%		\
+	--disable-ipv6		\
 	--disable-nls		\
 	, $(CONFIGURE_ARGS))