transmission: Fix build

http://hydra.nixos.org/build/22182663

pkgs/applications/networking/p2p/transmission/default.nix

···
 { stdenv, fetchurl, pkgconfig, intltool, file, makeWrapper
-, openssl, curl, libevent, inotifyTools, systemd
+, openssl, curl, libevent, inotifyTools, systemd, zlib
 , enableGTK3 ? false, gtk3
 }:
 
···
     sha256 = "1sxr1magqb5s26yvr5yhs1f7bmir8gl09niafg64lhgfnhv1kz59";
   };
 
-  buildInputs = [ pkgconfig intltool file openssl curl libevent inotifyTools ]
+  buildInputs = [ pkgconfig intltool file openssl curl libevent inotifyTools zlib ]
     ++ optionals enableGTK3 [ gtk3 makeWrapper ]
     ++ optional stdenv.isLinux systemd;