tdlib: init at 1.4.0

[vyorkin]

Motivation for this change

Adds the tdlib -- a cross-platform library for building Telegram clients.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• [] Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

---

[aanderse]

@vyorkin Are you interested in being listed as the package mantainer?

[risicle]

This appears to build fine on darwin too (macos 10.13), so you should be able to enable that.

[vyorkin]

@aanderse Yes, sure! I've updated the meta and added myself to the maintainer-list.nix

[aanderse]

LGTM 👍
@vyorkin Thanks for choosing to contribute to nixpkgs!

[aanderse]

@GrahamcOfBorg build tdlib