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

Make all changes to #include statements and build files.
diff --git a/configure.ac b/configure.ac
index 0fafb7f..fc8c737 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,8 +38,7 @@
 	Makefile
 	include/Makefile
 	include/osmocom/Makefile
-	include/osmocom/osmo-iuh/Makefile
-	include/osmocom/osmo-iuh/hnbap/Makefile
-	include/osmocom/osmo-iuh/ranap/Makefile
-	include/osmocom/osmo-iuh/rua/Makefile
+	include/osmocom/hnbap/Makefile
+	include/osmocom/ranap/Makefile
+	include/osmocom/rua/Makefile
 	)