Preparing libRS for for compilation on host.

Change-Id: I851add79831331c8a8b20dcccdb0817f8ad0c359
diff --git a/libs/rs/rs_hal.h b/libs/rs/rs_hal.h
index cfa4e74..9d8c906 100644
--- a/libs/rs/rs_hal.h
+++ b/libs/rs/rs_hal.h
@@ -47,7 +47,7 @@
 typedef struct {
     bool (*initGraphics)(const Context *);
     void (*shutdownGraphics)(const Context *);
-    bool (*setSurface)(const Context *, uint32_t w, uint32_t h, ANativeWindow *);
+    bool (*setSurface)(const Context *, uint32_t w, uint32_t h, RsNativeWindow);
     void (*swap)(const Context *);
 
     void (*shutdownDriver)(Context *);