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

Make all changes to #include statements and build files.
diff --git a/src/rua/RUA_InitiatingMessage.c b/src/rua/RUA_InitiatingMessage.c
index e1a7d6f..bcadd0f 100644
--- a/src/rua/RUA_InitiatingMessage.c
+++ b/src/rua/RUA_InitiatingMessage.c
@@ -4,7 +4,7 @@
  * 	found in "../../asn1/rua/RUA-PDU.asn"
  */
 
-#include <osmocom/osmo-iuh/rua/RUA_InitiatingMessage.h>
+#include <osmocom/rua/RUA_InitiatingMessage.h>
 
 static asn_TYPE_member_t asn_MBR_RUA_InitiatingMessage_1[] = {
 	{ ATF_NOFLAGS, 0, offsetof(struct RUA_InitiatingMessage, procedureCode),