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

Change-Id: Ib23f591f8418d3318f61ab1d3f6f2b684bf95692
diff --git a/cpp/ScriptC.cpp b/cpp/ScriptC.cpp
index d431355..b107901 100644
--- a/cpp/ScriptC.cpp
+++ b/cpp/ScriptC.cpp
@@ -15,6 +15,7 @@
  */
 
 #include "RenderScript.h"
+#include "rsCppInternal.h"
 
 using namespace android;
 using namespace RSC;