Reenable warnings in src/codec

gyp/images.gyp

Index: gyp/images.gyp
diff --git a/gyp/images.gyp b/gyp/images.gyp
index 8dd34492c1a4aebfd6f3f5518f183a9256625be6..3c46ec1a8f0bf659bedc21feea5f1ab9278a5ed9 100644
--- a/gyp/images.gyp
+++ b/gyp/images.gyp
@@ -131,6 +131,13 @@
           'dependencies': [
              'android_deps.gyp:png',
           ],
+          'cflags' : [
+            # SkImageDecoder_libpng includes png.h.
+            # In the version of libpng that we use on Android (1.2.46),
+            # there is a missing space between a literal and an identifier
+            # in png.h, triggering a warning in C++11.
+            '-Wno-literal-suffix',
+          ],
           'conditions': [
             [ 'skia_android_framework == 0', {
               'export_dependent_settings': [