libunarr: backport cmake-4 incompatibility

Without the upstream fix the build fails as:

    libunarr> CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
    libunarr>   Compatibility with CMake < 3.5 has been removed from CMake.

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

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchurl,
+  fetchpatch,
   cmake,
 }:
 
@@ -14,6 +15,16 @@ stdenv.mkDerivation rec {
     hash = "sha256-Mo76BOqZbdOJFrEkeozxdqwpuFyvkhdONNMZmN5BdNI=";
   };
 
+  patches = [
+    # cmake-4 compatibility:
+    #   https://github.com/selmf/unarr/pull/30
+    (fetchpatch {
+      name = "cmake-4.patch";
+      url = "https://github.com/selmf/unarr/commit/1df8ab3d281409e9fe6bed8bf485976bb47f5bef.patch";
+      hash = "sha256-u3shRgtRcHYxvXAHmYyQH1HLYV1PgWaJBY7BZCOYiL4=";
+    })
+  ];
+
   postPatch = lib.optionalString stdenv.hostPlatform.isDarwin ''
     substituteInPlace CMakeLists.txt \
       --replace "-flto" "" \