temp: fix 7zip compilation

Author: sandydoo

nix/default.nix

@@ -109,8 +109,13 @@ let
     };
 in
 import nixpkgs {
-  overlays = [ overlay ];
+  overlays = [
+    overlay
+    (final: prev: {
+      _7zz = prev._7zz.override { useUasm = (prev.stdenv.hostPlatform.isLinux && prev.stdenv.hostPlatform.isx86); };
+    })
+  ];
   # broken is needed for hindent to build
-  config = { allowBroken = true; };
+  config = { allowBroken = true; allowUnfree = true; };
   inherit system;
 }