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_InitiatingMessage.h b/include/osmocom/rua/RUA_InitiatingMessage.h
index 1b321af..a488a99 100644
--- a/include/osmocom/rua/RUA_InitiatingMessage.h
+++ b/include/osmocom/rua/RUA_InitiatingMessage.h
@@ -11,8 +11,8 @@
 #include <asn_application.h>
 
 /* Including external dependencies */
-#include <osmocom/osmo-iuh/rua/RUA_ProcedureCode.h>
-#include <osmocom/osmo-iuh/rua/RUA_Criticality.h>
+#include <osmocom/rua/RUA_ProcedureCode.h>
+#include <osmocom/rua/RUA_Criticality.h>
 #include <ANY.h>
 #include <constr_SEQUENCE.h>