[misc] Move handover into libmsc.a

Handover is a high level decision, it can span multiple BSCs
and belongs mostly into the MSC domain.
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 4def2e9..7abec69 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -7,16 +7,17 @@
 noinst_HEADERS = vty/cardshell.h
 
 libbsc_a_SOURCES = abis_rsl.c abis_nm.c gsm_data.c gsm_04_08_utils.c \
-		msgb.c select.c chan_alloc.c timer.c debug.c handover_logic.c \
+		msgb.c select.c chan_alloc.c timer.c debug.c \
 		gsm_subscriber_base.c subchan_demux.c bsc_rll.c transaction.c \
 		trau_frame.c trau_mux.c paging.c e1_config.c e1_input.c tlv_parser.c \
 		input/misdn.c input/ipaccess.c signal.c gsm_utils.c talloc.c \
 		talloc_ctx.c system_information.c bitvec.c rest_octets.c \
-		handover_decision.c meas_rep.c rtp_proxy.c
+		rtp_proxy.c
 
 libmsc_a_SOURCES = gsm_subscriber.c db.c telnet_interface.c \
 		mncc.c gsm_04_08.c gsm_04_11.c transaction.c \
-		token_auth.c rrlp.c gsm_04_80.c ussd.c silent_call.c
+		token_auth.c rrlp.c gsm_04_80.c ussd.c silent_call.c \
+		handover_logic.c handover_decision.c meas_rep.c
 
 libvty_a_SOURCES = vty/buffer.c vty/command.c vty/vector.c vty/vty.c