mncc: Move the cc_tx_to_mncc code into the libbsc.a

The trau_mux likes to call cc_tx_to_mncc for each received
frame from the E1 link. Using a signal for each audio frame
is messy as well. The best thing I could think of is to put
this into the BSC to deref the pointer. The other option would
be to include the gsm_data.h in the mncc.h header and have
the method as inline.
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index c86fc26..290bc06 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -22,7 +22,7 @@
 		trau_frame.c trau_mux.c paging.c e1_config.c e1_input.c \
 		input/misdn.c input/ipaccess.c handover_logic.c \
 		talloc_ctx.c system_information.c rest_octets.c \
-		bts_siemens_bs11.c bts_ipaccess_nanobts.c \
+		bts_siemens_bs11.c bts_ipaccess_nanobts.c mncc_upqueue.c \
 		bts_unknown.c bsc_version.c bsc_api.c bsc_vty.c meas_rep.c gsm_04_80.c
 
 libmsc_a_SOURCES = gsm_subscriber.c db.c \