2/2: fixup: add osmo_gsup_peer_id with type enum and union

During code review it was requested to insert an ability to handle different
kinds of peer id, in order to be able to add a Global Title in the future.

Add this, but only in the publicly visible API. For osmo-hlr internal code, I
intend to push implementing this into the future, when a different peer
identification actually gets introduced.

This way we don't need to implement it now in all osmo-hlr code paths (save
time now), but still make all API users aware that this type may be extended in
the future.

Change-Id: Ide9dcdca283ab989240cfc6e53e9211862a199c5
diff --git a/include/Makefile.am b/include/Makefile.am
index aeeb03f..cf95854 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -1,7 +1,7 @@
 SUBDIRS = osmocom
 
 nobase_include_HEADERS = \
-	osmocom/gsupclient/ipa_name.h \
+	osmocom/gsupclient/gsup_peer_id.h \
 	osmocom/gsupclient/gsup_client.h \
 	osmocom/gsupclient/gsup_req.h \
 	osmocom/mslookup/mdns.h \