tests/Makefile.am: do not LDADD libnutclient.la where we (also) use libnutclientstub.la

Avoid linker warning:
	  CXXLD    cppnit
	ld: warning: file /export/home/abuild/nut/obj/nut-2.8.2.1775.28/_build/sub/clients/.libs/libnutclient.so:
	  linked to ../clients/.libs/libnutclient.so: attempted multiple inclusion of file

Signed-off-by: Jim Klimov <jimklimov@gmail.com>

Author: jimklimov

tests/Makefile.am

@@ -150,11 +150,11 @@ check-local: $(check_PROGRAMS)
 	RES=0; for P in $? ; do $(VALGRIND) ./$$P || { RES=$$? ; echo "FAILED: $(VALGRIND) ./$$P" >&2; }; done; exit $$RES
 endif WITH_VALGRIND
 
+# NOTE: libnutclientstub includes libnutclient and adds nutclientmem
 cppunittest_CXXFLAGS = $(AM_CXXFLAGS) $(CPPUNIT_CFLAGS) $(CPPUNIT_CXXFLAGS) $(CPPUNIT_NUT_CXXFLAGS) $(CXXFLAGS)
 ###cppunittest_CXXFLAGS += -I$(top_srcdir)/include -DTOP_SRCDIR="\"$(top_srcdir)\""
 cppunittest_LDFLAGS = $(CPPUNIT_LDFLAGS) $(CPPUNIT_LIBS)
-cppunittest_LDADD  = $(top_builddir)/clients/libnutclient.la
-cppunittest_LDADD += $(top_builddir)/clients/libnutclientstub.la
+cppunittest_LDADD   = $(top_builddir)/clients/libnutclientstub.la
 cppunittest_SOURCES = $(CPPUNITTESTSRC) $(CPPUNITTESTERSRC)
 
 # Currently nutconf and related codebase causes woes for static analysis
@@ -166,7 +166,7 @@ endif WITH_NUTCONF
 
 cppnit_CXXFLAGS = $(AM_CXXFLAGS) $(CPPUNIT_CFLAGS) $(CPPUNIT_CXXFLAGS) $(CPPUNIT_NUT_CXXFLAGS) $(CXXFLAGS)
 cppnit_LDFLAGS = $(CPPUNIT_LDFLAGS) $(CPPUNIT_LIBS)
-cppnit_LDADD = $(top_builddir)/clients/libnutclient.la $(top_builddir)/clients/libnutclientstub.la
+cppnit_LDADD   = $(top_builddir)/clients/libnutclientstub.la
 cppnit_SOURCES = $(CPPCLIENTTESTSRC) $(CPPUNITTESTERSRC)
 
 # Make sure out-of-dir C++ dependencies exist (especially when dev-building