libbinder_ndk: wall/wextra

Bug: 120905566
Test: N/A
Change-Id: I07f69d07b23ad0cc8e624045b902104c6b2862b6
diff --git a/libs/binder/ndk/Android.bp b/libs/binder/ndk/Android.bp
index dc4e000..1b69dfd 100644
--- a/libs/binder/ndk/Android.bp
+++ b/libs/binder/ndk/Android.bp
@@ -23,6 +23,8 @@
         "include_apex",
     ],
 
+    cflags: ["-Wall", "-Wextra", "-Werror"],
+
     srcs: [
         "ibinder.cpp",
         "ibinder_jni.cpp",