openssl: Disable async APIs
requested to merge ndufresne/cerbero:61-openssl-build-with-no-async-so-it-doesn-t-use-api-not-allowed-by-apple-app-store into master
Enabling async APIs imply using OS features are are not allowed by Apple. This should not affect GStreamer as we don't use these new APIs.
https://github.com/openssl/openssl/issues/2545
Closes #61 (closed)