provide software version information to gsup peer

Provide software version information to the GSUP peer. The version now
shows up in logs like this: Software_Version='osmo-msc-1.2.0.120-1263b'

Change-Id: I2eba32569349facdbb1fda201067c62cc804ccf4
Depends: I317d6c59f77e92fbb2b875a83dc0ec2fa5cb6006
Related: OS#3355
diff --git a/src/libmsc/gsm_04_08.c b/src/libmsc/gsm_04_08.c
index 7fe2c50..dc0476b 100644
--- a/src/libmsc/gsm_04_08.c
+++ b/src/libmsc/gsm_04_08.c
@@ -1835,6 +1835,7 @@
 	ipa_dev = talloc_zero(net->vlr, struct ipaccess_unit);
 	ipa_dev->unit_name = "MSC";
 	ipa_dev->serno = net->msc_ipa_name; /* NULL unless configured via VTY */
+	ipa_dev->swversion = PACKAGE_NAME "-" PACKAGE_VERSION;
 
 	return vlr_start(ipa_dev, net->vlr, net->gsup_server_addr_str, net->gsup_server_port);
 }