Create runtime stubs for compute driver.

Change-Id: I8e0250a642844a2ad3ff6efc38e385445b7da032
diff --git a/rsScriptC.h b/rsScriptC.h
index 2edeb9b..4c85745 100644
--- a/rsScriptC.h
+++ b/rsScriptC.h
@@ -47,6 +47,7 @@
                             const Allocation * ain,
                             Allocation * aout,
                             const void * usr,
+                            size_t usrBytes,
                             const RsScriptCall *sc = NULL);
 
     virtual void serialize(OStream *stream) const {    }