[sccp] Implement parts of ITU SCCP for use in the A-Interface

include/sccp/sccp_types.h contain Q.713 and GSM definitions
include/sccp/sccp.h is the application interface resembling
                    the esentials of the UNIX socket interface.

src/sccp.c is the actual implementation of SCCP featuring
           connection and UDT1 support.

tests/sccp/sccp.c is testing connection creation and formating
                  of the SCCP messages used by the A-interface. And
                  it contains a simple fuzzing test to test the
                  robustnes of the implementation.
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 891a112..7912008 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -2,7 +2,7 @@
 AM_CFLAGS=-Wall
 
 sbin_PROGRAMS = bsc_hack bs11_config ipaccess-find ipaccess-config isdnsync
-noinst_LIBRARIES = libbsc.a libmsc.a libvty.a
+noinst_LIBRARIES = libbsc.a libmsc.a libvty.a libsccp.a
 noinst_HEADERS = vty/cardshell.h
 
 libbsc_a_SOURCES = abis_rsl.c abis_nm.c gsm_data.c gsm_04_08_utils.c \
@@ -18,6 +18,8 @@
 
 libvty_a_SOURCES = vty/buffer.c vty/command.c vty/vector.c vty/vty.c
 
+libsccp_a_SOURCES = sccp/sccp.c
+
 bsc_hack_SOURCES = bsc_hack.c bsc_init.c vty_interface.c vty_interface_layer3.c
 bsc_hack_LDADD = libmsc.a libbsc.a libmsc.a libvty.a -ldl -ldbi $(LIBCRYPT)