discord: add libva to libPath (NixOS#444722)

Author: Artturin

pkgs/applications/networking/instant-messengers/discord/linux.nix

@@ -30,6 +30,7 @@
   libnotify,
   libpulseaudio,
   libuuid,
+  libva,
   libX11,
   libXScrnSaver,
   libXcomposite,
@@ -155,6 +156,7 @@ stdenv.mkDerivation (finalAttrs: {
       libXcomposite
       libunity
       libuuid
+      libva
       libXcursor
       libXdamage
       libXext