tv vim: add xmodmap

tv/2configs/vim.nix

@@ -347,6 +347,7 @@ let {
             (writerName ''\([^"]*\.\)\?vimrc'')
           ];
           xdefaults = {};
+          xmodmap = {};
         }))}
 
         " Clear syntax that interferes with nixINSIDE_DOLLAR_CURLY.
@@ -392,6 +393,9 @@ let {
           \ matchgroup=sedSemicolon end=";\|$"
           \ contains=sedWhitespace
       '';
+      "/syntax/xmodmap.vim".text = ''
+        syn match xmodmapComment /^\s*!.*/
+      '';
     }))
   ];