mgcp_e1: finish E1 support, add E1 support from libosmoabis

Currently only the endpoint handling for E1 exists, but there is no
actual code behind it that handles the E1 traffic.

Change-Id: I6b93809b5ac7d01af55888347dd787b0bc997ae1
Related: OS#2659
diff --git a/tests/mgcp/Makefile.am b/tests/mgcp/Makefile.am
index 95444b5..1224c0a 100644
--- a/tests/mgcp/Makefile.am
+++ b/tests/mgcp/Makefile.am
@@ -11,6 +11,8 @@
 	$(LIBOSMOVTY_CFLAGS) \
 	$(LIBOSMOGSM_CFLAGS) \
 	$(LIBOSMONETIF_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOTRAU_CFLAGS) \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
@@ -35,6 +37,8 @@
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOVTY_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMOTRAU_LIBS) \
 	$(LIBRARY_DL) \
 	$(LIBRARY_DLSYM) \
 	$(LIBOSMONETIF_LIBS) \