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cocos2dx-2.2.6のlibpng セキュリティバグ対応

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背景

GooglePlayからlibpngのセキュリティ警告が来ていたので対応。

関連
- Need to update libpng for v2.x because of security issue reported by Google Play #15871

対応方法

1. cocos2dxから提供されたthird_partyのlibpng/zlibをDLする

2. 中身を置換する

$ rm $COCOS2DX_ROOT/cocos2dx/platform/third_party/android/prebuilt/libpng
$ mv cocos2d-x-3rd-party-libs-bin/cocos2dx/platform/third_party/android/prebuilt/libpng $COCOS2DX_ROOT/cocos2dx/platform/third_party/android/prebuilt/
$ mv cocos2d-x-3rd-party-libs-bin/cocos2dx/platform/third_party/android/prebuilt/zlib $COCOS2DX_ROOT/cocos2dx/platform/third_party/android/prebuilt/

3. Android.mkを書き換える

本体のAndroidNDK側のzlibを利用しないようにする設定 & zlibのターゲット追加を行う

$ curl -O https://raw.githubusercontent.com/cocos2d/cocos2d-x/v2/cocos2dx/Android.mk
$ cp Android.mk $COCOS2DX_ROOT/cocos2dx/Android.mk

diffはこんな感じ

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