coding test: cosmetic cleanup

* remove duplicate code: use function from libosmocore
* use utility function to dump ubits
* reformat for easier reading
* link against libosmocore

Change-Id: I8c31b0954176a2c53305936a025c92a793b6d9b6
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e11092d..c609d6a 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -165,7 +165,7 @@
 socket_socket_test_SOURCES = socket/socket_test.c
 
 coding_coding_test_SOURCES = coding/coding_test.c
-coding_coding_test_LDADD = \
+coding_coding_test_LDADD = $(LDADD) \
   $(top_builddir)/src/gsm/libosmogsm.la \
   $(top_builddir)/src/codec/libosmocodec.la \
   $(top_builddir)/src/coding/libosmocoding.la