Fix CMake build for Android

See #426 (closed): It seems the cmake based build has some issues with Crypto libraries.

The suspicion so far: It seems that at least for the arm64 bit build, the OpenSSH libraries are not loaded. Hence, no HTTPS connection can be made. At least x86_64 builds in turn seem to work (as seen in the simulator). This could even be a Qt bug. We should try to find out what goes wrong, either fix this on our side or report upstream.