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

Change-Id: I81f438ae444f04c12ae27ae4ef6d073033de172c
diff --git a/include/media/IMediaMetadataRetriever.h b/include/media/IMediaMetadataRetriever.h
index 95851fd..c90f254 100644
--- a/include/media/IMediaMetadataRetriever.h
+++ b/include/media/IMediaMetadataRetriever.h
@@ -27,7 +27,7 @@
 namespace android {
 
 class IDataSource;
-class IMediaHTTPService;
+struct IMediaHTTPService;
 
 class IMediaMetadataRetriever: public IInterface
 {