links2: mark as broken

Failing Hydra build: https://hydra.nixos.org/build/344163770

Code-golfing to do

    if (strchr(cast_const_char ud, POST_CHAR)) *strchr(cast_const_char ud, POST_CHAR) = 0;

means we can't workaround the failure with
-Wno-error=discarded-qualifiers like we did for every other package.

Also, upstream doesn't use any forge, so I'm not going to bother
patching this 🤷

pkgs/by-name/li/links2/package.nix

@@ -76,5 +76,6 @@ stdenv.mkDerivation (finalAttrs: {
     mainProgram = "links";
     license = lib.licenses.gpl2Plus;
     platforms = lib.platforms.unix;
+    broken = true;
   };
 })