tests: dlopen does not imply availability of dlsym..

Check for both.

Change-Id: I1a1e82882ad28dd53e634f10f9cebb4bc74cac1e

configure.ac

@@ -38,6 +38,9 @@ dnl checks for libraries
 AC_SEARCH_LIBS([dlopen], [dl dld], [LIBRARY_DL="$LIBS";LIBS=""])
 AC_SUBST(LIBRARY_DL)
 
+AC_SEARCH_LIBS([dlsym], [dl dld], [LIBRARY_DLSYM="$LIBS";LIBS=""])
+AC_SUBST(LIBRARY_DLSYM)
+
 
 PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.1.0)
 PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 1.1.0)

tests/mgcp/Makefile.am

@@ -36,6 +36,7 @@ mgcp_test_LDADD = \
 	$(LIBOSMOVTY_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
 	$(LIBRARY_DL) \
+	$(LIBRARY_DLSYM) \
 	$(LIBOSMONETIF_LIBS) \
 	-lm  \
 	$(NULL)

tests/mgcp_client/Makefile.am

@@ -35,6 +35,7 @@ mgcp_client_test_LDADD = \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOVTY_LIBS) \
 	$(LIBRARY_DL) \
+	$(LIBRARY_DLSYM) \
 	$(LIBOSMONETIF_LIBS) \
 	$(NULL)