Remove osmo-iuh subdir level from include/ (2/2)

Make all changes to #include statements and build files.
diff --git a/include/osmocom/rua/RUA_IE.h b/include/osmocom/rua/RUA_IE.h
index 3ab05e0..cd1266f 100644
--- a/include/osmocom/rua/RUA_IE.h
+++ b/include/osmocom/rua/RUA_IE.h
@@ -11,8 +11,8 @@
 #include <asn_application.h>
 
 /* Including external dependencies */
-#include <osmocom/osmo-iuh/rua/RUA_ProtocolIE-ID.h>
-#include <osmocom/osmo-iuh/rua/RUA_Criticality.h>
+#include <osmocom/rua/RUA_ProtocolIE-ID.h>
+#include <osmocom/rua/RUA_Criticality.h>
 #include <ANY.h>
 #include <constr_SEQUENCE.h>