Use -Werror in external/dtc am: bea7af187e am: 86793a3f61
am: c16520de98

Change-Id: Id6e599c3e4f60addd322360718ef1a8f9cef72ee
diff --git a/libfdt/Android.bp b/libfdt/Android.bp
index f496f8f..e92497b 100644
--- a/libfdt/Android.bp
+++ b/libfdt/Android.bp
@@ -3,6 +3,7 @@
     host_supported: true,
 
     cflags: [
+        "-Werror",
         "-Wno-macro-redefined",
         "-Wno-sign-compare",
     ],