Remove superfluous dependency in Makefile.am.

[Ralf Wildenhues]

Pushed as obvious: there is nothing that would generate demo-conf.test
and I couldn't find any reason for the test result to depend on the
libtool script in particular.

Cheers,
Ralf

    Remove superfluous dependency in Makefile.am.
    
    * Makefile.am (tests/demo-conf.test): Remove dependency on
    libtool, this test is a primary source and not generated.

diff --git a/Makefile.am b/Makefile.am
index e0bf83d..d358e09 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -690,8 +690,6 @@ if HAVE_FC
 TESTS += $(FC_TESTS)
 endif
 
-tests/demo-conf.test: libtool
-
 EXTRA_DIST     += $(srcdir)/tests/defs.in tests/defs.m4sh \
                  $(COMMON_TESTS) $(CXX_TESTS) $(F77_TESTS) $(FC_TESTS)
 DIST_SUBDIRS   += $(CONF_SUBDIRS)