Frameworks/base: Fix AAPT warnings

Turn on -Wall -Werror. Fix warnings.

Change-Id: I287fb3c1e851c654479bcf9ea8c73bd354a6b2a1
diff --git a/tools/aapt/CacheUpdater.h b/tools/aapt/CacheUpdater.h
index 0e65589..0af5872 100644
--- a/tools/aapt/CacheUpdater.h
+++ b/tools/aapt/CacheUpdater.h
@@ -35,6 +35,8 @@
 
     // Process an image from source out to dest
     virtual void processImage(String8 source, String8 dest) = 0;
+
+    virtual ~CacheUpdater() {}
 private:
 };
 
@@ -104,4 +106,4 @@
     Bundle* bundle;
 };
 
-#endif // CACHE_UPDATER_H
\ No newline at end of file
+#endif // CACHE_UPDATER_H