build: move headers to include/osmocom/*
This came up while fixing 'make distcheck'; this is certainly not the easiest
way but it makes sense to have the headers in include/, like we do in openbsc.
The easy alternative might be to add -I$(top_srcdir)/src to src/Makefile.am.
Remove -I$(top_srcdir)/src from src/tests/Makefile.am, no longer needed.
Change-Id: I5a82e029dcdc4df0a60a31271a4883393fe59234
diff --git a/src/rua_common.c b/src/rua_common.c
index a5ab044..3c9d773 100644
--- a/src/rua_common.c
+++ b/src/rua_common.c
@@ -24,7 +24,7 @@
#include <osmocom/core/msgb.h>
#include <osmocom/rua/rua_common.h>
-#include "hnbgw.h"
+#include <osmocom/iuh/hnbgw.h>
extern int asn1_xer_print;