ltsmin: do not install the library

For some reason, we used to install the library (causing the warning
from Lintian while building the Debian packages) and not the binary.
Let's not install any of these: the user interface is not nice enough.

* iface/ltsmin/Makefile.am: Do not install libspotltsmin.la.

iface/ltsmin/Makefile.am

-## Copyright (C) 2011, 2013, 2014 Laboratoire de Recherche et Developpement
-## de l'Epita (LRDE).
+## -*- coding: utf-8 -*-
+## Copyright (C) 2011, 2013, 2014, 2015 Laboratoire de Recherche et
+## Developpement de l'Epita (LRDE).
 ##
 ## This file is part of Spot, a model checking library.
 ##
@@ -24,7 +25,7 @@ ltsmindir = $(pkgincludedir)/iface/ltsmin
 
 ltsmin_HEADERS = ltsmin.hh
 
-lib_LTLIBRARIES = libspotltsmin.la
+noinst_LTLIBRARIES = libspotltsmin.la
 libspotltsmin_la_LIBADD = \
   $(top_builddir)/src/libspot.la \
   $(top_builddir)/ltdl/libltdlc.la -lpthread