Upgraded to 5.3.5f1 and still getting the error on submission that is supposedly fixed, as described by this issue:
Anyone at Unity can confirm if the fix really went in 5.3.5f1? We just compiled new builds and the same submission error is being reported (actually the build is accepted but then Apple rejects it with the following email excerpt)
Non-public API usage:
- The app references non-public symbols in game: _LZ4_compressBound, _LZ4_compress_limitedOutput, _LZ4_decompress_safe
If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed.
If you think this message was sent in error and that you have only used Apple-published APIs in accordance with the guidelines, send the app’s nine-digit Apple ID, along with detailed information about why you believe the above APIs were incorrectly flagged, to appreview@apple.com. For further information, visit the Technical Support Information page.