Revert "vivado: fix ncurses"

Doesn't evaluate.

This reverts commit 02ffc97089.

artiq-fast/vivado.nix

@@ -6,15 +6,8 @@
 pkgs.buildFHSUserEnv {
   name = "vivado";
   targetPkgs = pkgs: (
-    with pkgs; let
-    # Apply patch from https://github.com/nix-community/nix-environments/pull/54
-    # to fix ncurses libtinfo.so's soname issue
-      ncurses' = ncurses5.overrideAttrs (old: {
-        configureFlags = old.configureFlags ++ [ "--with-termlib" ];
-        postFixup = "";
-      });
-    in [
-      (ncurses'.override { unicodeSupport = false; })
+    with pkgs; [
+      ncurses5
       zlib
       libuuid
       xorg.libSM