Snap for 4386413 from 6e267ffb6f981d1abd9913c5d0d9856771254fdb to pi-release

Change-Id: I9d72116e5e4a7a3b7618119cb42ba782d2c7de0b
diff --git a/Android.bp b/Android.bp
index 4065193..aea02bf 100644
--- a/Android.bp
+++ b/Android.bp
@@ -22,6 +22,8 @@
     ],
     cflags: [
         "-std=gnu89",
+        "-Wall",
+        "-Werror",
         "-Wno-unused-parameter",
     ],
     arch: {
@@ -106,6 +108,7 @@
     gtest: false,
     srcs: ["pngtest.c"],
     name: "pngtest",
+    cflags: ["-Wall", "-Werror"],
     shared_libs: [
         "libpng",
         "libz",