Remove excessive 'dnl's from libupnp.m4. git-svn-id: https://pupnp.svn.sourceforge.net/svnroot/pupnp/branches/branch-1.6.x@555 119443c7-1b9e-41f8-b6fc-b9c35fce742c
configure script. git-svn-id: https://pupnp.svn.sourceforge.net/svnroot/pupnp/branches/branch-1.6.x@449 119443c7-1b9e-41f8-b6fc-b9c35fce742c