native frameworks: 64-bit compile issues

- Fix format (print/scanf)
- Suppress unused argument warning messages (bonus)

Change-Id: I05c7724d2aba6da1e82a86000e11f3a8fef4e728
diff --git a/services/surfaceflinger/RenderEngine/GLES11RenderEngine.cpp b/services/surfaceflinger/RenderEngine/GLES11RenderEngine.cpp
index 521a5d2..cbff320 100644
--- a/services/surfaceflinger/RenderEngine/GLES11RenderEngine.cpp
+++ b/services/surfaceflinger/RenderEngine/GLES11RenderEngine.cpp
@@ -237,7 +237,7 @@
     }
 }
 
-void GLES11RenderEngine::beginGroup(const mat4& colorTransform) {
+void GLES11RenderEngine::beginGroup(const mat4& /*colorTransform*/) {
     // doesn't do anything in GLES 1.1
 }