libevent: remove unused vulnerable 1.4.x version

pkgs/development/libraries/libevent/1.4.nix

@@ -1,29 +0,0 @@
-{stdenv, fetchurl}:
-
-let version = "1.4.14b"; in
-stdenv.mkDerivation {
-  name = "libevent-${version}";
-
-  src = fetchurl {
-    url = "https://github.com/downloads/libevent/libevent/libevent-${version}-stable.tar.gz";
-    sha256 = "00b3wih3qpcik6v0qh1406abs2xb954d58ncqwzs8ar2d93ip9mg";
-  };
-
-  meta = {
-    description = "libevent, an event notification library";
-
-    longDescription =
-      '' The libevent API provides a mechanism to execute a callback function
-         when a specific event occurs on a file descriptor or after a timeout
-         has been reached.  Furthermore, libevent also support callbacks due
-         to signals or regular timeouts.
-
-         libevent is meant to replace the event loop found in event driven
-         network servers.  An application just needs to call event_dispatch()
-         and then add or remove events dynamically without having to change
-         the event loop.
-      '';
-
-    license = "mBSD";
-  };
-}

pkgs/top-level/all-packages.nix

@@ -7000,7 +7000,6 @@ let
 
   libev = callPackage ../development/libraries/libev { };
 
-  libevent14 = callPackage ../development/libraries/libevent/1.4.nix { };
   libevent = callPackage ../development/libraries/libevent { };
 
   libewf = callPackage ../development/libraries/libewf { };