sys-auth/nss-mdns: Pass --enable/--disable-tests explicitly

Upstream now enables tests by default and the configure script fails
if dev-libs/check is not present. Pass --enable/--disable-tests
appropriately to control the dependency check.

sys-auth/nss-mdns/nss-mdns-9999.ebuild

@@ -28,6 +28,8 @@ multilib_src_configure() {
 	local myconf=(
 		# $(localstatedir)/run/... is used to locate avahi-daemon socket
 		--localstatedir=/var
+
+		$(use_enable test tests)
 	)
 
 	ECONF_SOURCE=${S} \