Mumble is using a deprecated OpenSSL API and this is causing problems
because OpenSSL 1.1 support should be dropped from nixpkgs. However, a
patch making Mumble compatible to the OpenSSL 3.0 API is available on
its master branch and included in the latest snapshot, but unfortunately
that snapshot is not production ready.
Apply the patch for the nixpkgs build so that we can get rid of that old
OpenSSL version and drop the specific Qt package using it.
Signed-off-by: Felix Singer <felixsinger@posteo.net>
