vim/update.py: mark some plugins as neovim ones

so that they use buildNeovimFrom2Nix

I want to avoid adding a more complex heuristic for now or adding a
column to vim-plugin-names.

pkgs/applications/editors/vim/plugins/update.py

@@ -116,7 +116,13 @@ class VimEditor(pluginupdate.Editor):
 def main():
 
     global luaPlugins
-    luaPlugins = run_nix_expr(GET_PLUGINS_LUA)
+
+    # whitelist
+    luaPlugins = run_nix_expr(GET_PLUGINS_LUA) + [
+        "diffview-nvim",
+        "marks-nvim",
+        "nvim-biscuits"
+    ]
 
     editor = VimEditor("vim", ROOT, GET_PLUGINS)
     parser = editor.create_parser()