libupnp: restore building tools

This enables tools again which has been disabled in commit
498506af9 ("libupnp: update to 1.14.5"). Disabling tools leads to the
header upnptools.h not being installed into /usr/include. But e.g. mpd-full
depends on this header.

Fixes: 498506af9 ("libupnp: update to 1.14.5")
Signed-off-by: Alexander Egorenkov <egorenar-dev@posteo.net>

libs/libupnp/Makefile

@@ -59,7 +59,7 @@ CMAKE_OPTIONS += \
 	-Doptssdp=OFF \
 	-Dsoap=ON \
 	-Dgena=ON \
-	-Dtools=O$(if $(CONFIG_PACKAGE_libupnp-sample),N,FF) \
+	-Dtools=ON \
 	-Dipv6=O$(if $(CONFIG_IPV6),N,FF) \
 	-Dunspecified_server=OFF \
 	-Dopen_ssl=OFF \