misc: Link to libosmogsm after adding our static libraries

GCC 4.6.0 and LD.BFD 2.21 on ARM somehow fail to resolve
the dbi symbols when we have the library in front of the
static libraries, move them to the back.

Without this patch the tlv_def_patch symbol and the
gsm48_construct_ra.
diff --git a/openbsc/tests/channel/Makefile.am b/openbsc/tests/channel/Makefile.am
index a9ce3ea..404ab32 100644
--- a/openbsc/tests/channel/Makefile.am
+++ b/openbsc/tests/channel/Makefile.am
@@ -4,7 +4,7 @@
 noinst_PROGRAMS = channel_test
 
 channel_test_SOURCES = channel_test.c
-channel_test_LDADD = -ldl $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) \
+channel_test_LDADD = -ldl $(LIBOSMOCORE_LIBS) \
 	$(top_builddir)/src/libcommon/libcommon.a \
 	$(top_builddir)/src/libbsc/libbsc.a \
-	$(top_builddir)/src/libmsc/libmsc.a -ldbi
+	$(top_builddir)/src/libmsc/libmsc.a -ldbi $(LIBOSMOGSM_LIBS)