honour DISABLE_IPV6

pass --disable-ipv6 to autoconfig packages if IPv6 support is turned off

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/Makefile.autotools.in

@@ -256,6 +256,7 @@ $(BUILD_DIR)/%/.stamp_configured:
 		$(DISABLE_DOCUMENTATION) \
 		$(DISABLE_NLS) \
 		$(DISABLE_LARGEFILE) \
+		$(DISABLE_IPV6) \
 		$(QUIET) $($(PKG)_CONF_OPT)
 	$(Q)touch $@