Use -Werror in external/nanopb-c am: dd38963ae7
am: 9731ff6d2b

Change-Id: I1e1dc93ecc7cd7a2e9b4ba9fac89c11b9bf44f34
diff --git a/Android.bp b/Android.bp
index 29722c4..f7d729f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -17,6 +17,8 @@
 cc_defaults {
     name: "libprotobuf-c-nano-defaults",
     cflags: [
+        "-Wall",
+        "-Werror",
         "-Wno-sign-compare",
         "-Wno-unused-parameter",
     ],