Use -Werror in external/sonic
am: c4d7bdd54c

Change-Id: Idafffbc2f060a1ec3c82c0fb0147fed871bad6c0
diff --git a/Android.bp b/Android.bp
index 542e254..617955b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -6,6 +6,8 @@
     cflags: [
         "-Wno-sequence-point",
         "-Wno-extra",
+        "-Wall",
+        "-Werror",
     ],
 
     cppflags: ["-std=c++98"],