*Issue*
The OpenSSL library embedded in the recent versions of GStreamer is causing apps to be rejected. 

I believe this is due to the OpenSSL async library using the `getcontext` and `makecontext` commands. These are "non-public API methods" that Apple does not allow.


Here is the message from Apple. When I removed the GStreamer library, used by the CommunicaitonAPI framework, the app was accepted. OpenSSL had the only reference to `makecontext` and `getcontext` that I could see.


Non-public API usage:

The app references non-public symbols in Frameworks/CommunicationAPI.framework/CommunicationAPI: _getcontext, _makecontext, _setcontext


**Steps to reproduce**
I would suggest embedding the GStreamer framework into a simple app and submitting it, however Apple does not always pick up on these private APIs first time.

It is worth noting that other people have had a similar issue
https://github.com/openssl/openssl/issues/2545


**Suggested fix**
Adding the OpenSSL build setting `no-async` to the Cerbero OpenSSL recipe should fix the issue

I tried doing this myself, but I ran into errors packaging the GStreamer framework.