autoconf >=2.68 demands the body of an AC_COMPILE_IFELSE to be wrapped in
an AC_LANG_SOURCE macro, otherwise outputs annoying warnings on the
invocation of `autoreconf -i`. this patch follows that demand.
SCCP can be wrapped inside the MTP Level3, and one can
use it for link testing as well. This repository should
be renamed to libosmo-itu or libosmo-ss7 and be a host
to SS7 related encapsulation...
The code is coming from the cellmgr-ng code.