zfs_unstable: add FIDEDUPERANGE patch

Same patch already applied to zfs_2_4. Both track 2.4.2.

Author: Mic92

pkgs/os-specific/linux/zfs/unstable.nix

@@ -25,6 +25,11 @@ callPackage ./generic.nix args {
 
   hash = "sha256-I1wLbstr0cFiGsyynP9kJ9ATRp/2b+fnnsdz0up+IzM=";
 
+  extraPatches = [
+    # FIDEDUPERANGE support, sent upstream
+    ./fideduperange.patch
+  ];
+
   extraLongDescription = ''
     This is "unstable" ZFS, and will usually be a pre-release version of ZFS.
     It may be less well-tested and have critical bugs.