fr: Fix the linking of the test and use $(LIBRARY_DL) for linking
On Ubuntu 13.04 the build was failing on the OBS with:
/usr/bin/ld: fr_test.o: undefined reference to symbol 'dlsym@@GLIBC_2.2.5'
/usr/bin/ld: note: 'dlsym@@GLIBC_2.2.5' is defined in DSO /lib/x86_64-linux-gnu/libdl.so.2 so try adding it to the linker command line
/lib/x86_64-linux-gnu/libdl.so.2: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
diff --git a/tests/Makefile.am b/tests/Makefile.am
index bc9b7de..e5fc718 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -54,7 +54,7 @@
logging_logging_test_LDADD = $(top_builddir)/src/libosmocore.la
fr_fr_test_SOURCES = fr/fr_test.c
-fr_fr_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la
+fr_fr_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(LIBRARY_DL)
loggingrb_loggingrb_test_SOURCES = logging/logging_test.c
loggingrb_loggingrb_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/vty/libosmovty.la