0.2.3.1 tarball doesn't contain tor-fw-helper manpage
Stephen Walker reports that building from the 0.2.3.1 tarball fails when the --enable-upnp option is passed during configure. Because we didn't want to build the manpage when it isn't needed, we also didn't include it in the tarball if --enable-upnp or --enable-nat-pmp didn't get passed during configure.