OML: expand status reporting checks

* check GPRS state: if GPRS is enabled for the BTS but NSE, CELL or both
  NSVC are locked than report it as degraded
* check TRX usability: use already available function to check that TRX
  is actually usable when reporting OML status via CTRL
* fix tests linking: libbsc is using gsm48_create_mm_serv_rej() which is
  defined in libcommon-cs but neither libbsc itself nor tests using it
  are actually linked against libcommon-cs

Related: OS#2486
Change-Id: I9dce1d3b0cabe149a90cfca58a3fe55f8d6a72bc
diff --git a/tests/abis/Makefile.am b/tests/abis/Makefile.am
index 1c5dede..8dc6248 100644
--- a/tests/abis/Makefile.am
+++ b/tests/abis/Makefile.am
@@ -27,6 +27,7 @@
 abis_test_LDADD = \
 	$(top_builddir)/src/libbsc/libbsc.a \
 	$(top_builddir)/src/libcommon/libcommon.a \
+	$(top_builddir)/src/libcommon-cs/libcommon-cs.a \
 	$(top_builddir)/src/libtrau/libtrau.a \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOABIS_LIBS) \