stagefright: warnings be gone, some are now errors, use clang

Change-Id: I81f438ae444f04c12ae27ae4ef6d073033de172c
diff --git a/include/media/MediaMetadataRetrieverInterface.h b/include/media/MediaMetadataRetrieverInterface.h
index df6c7d6..bce6ee3 100644
--- a/include/media/MediaMetadataRetrieverInterface.h
+++ b/include/media/MediaMetadataRetrieverInterface.h
@@ -26,7 +26,7 @@
 namespace android {
 
 class DataSource;
-class IMediaHTTPService;
+struct IMediaHTTPService;
 
 // Abstract base class
 class MediaMetadataRetrieverBase : public RefBase