Cleanup includes for rs/cpp to not expose internal details.

Change-Id: Ib23f591f8418d3318f61ab1d3f6f2b684bf95692
diff --git a/rsElement.h b/rsElement.h
index 5c44ba0..ccf69eb 100644
--- a/rsElement.h
+++ b/rsElement.h
@@ -21,7 +21,7 @@
 
 #include "rsComponent.h"
 #include "rsUtils.h"
-#include "rsDefines.h"
+#include "rsInternalDefines.h"
 #include "rsObjectBase.h"
 
 // ---------------------------------------------------------------------------