Use -Werror in external/dng_sdk am: 1ab71199fe am: 9fb2201fe0
am: 630e4f3cf3

Change-Id: I4ea4a0267171e4da5cd1cfbcf34aeb882a50f60e
diff --git a/Android.bp b/Android.bp
index 8d37d9a..b7a4c0c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -75,6 +75,7 @@
         "-DqDNGUseXMP=0",
         "-DqDNGValidateTarget=1",
         "-DqAndroid=1",
+        "-Werror",
         "-Wsign-compare",
         "-Wno-reorder",
         "-Wframe-larger-than=20000",