build(flake): Wrap mold so that it works with the nix supplied libraries

flake.nix

@@ -52,6 +52,28 @@
     ...
   }:
     flake-utils.lib.eachDefaultSystem (system: let
+      inherit (pkgs) lib;
+      bintools-wrapper = "${nixpkgs}/pkgs/build-support/bintools-wrapper";
+      mold' = pkgs.symlinkJoin {
+        name = "mold";
+        paths = [pkgs.mold];
+        nativeBuildInputs = [pkgs.makeWrapper];
+        suffixSalt = lib.replaceStrings ["-" "."] ["_" "_"] pkgs.targetPlatform.config;
+        postBuild = ''
+          for bin in ${pkgs.mold}/bin/*; do
+            rm $out/bin/"$(basename "$bin")"
+
+            export prog="$bin"
+            substituteAll "${bintools-wrapper}/ld-wrapper.sh" $out/bin/"$(basename "$bin")"
+            chmod +x $out/bin/"$(basename "$bin")"
+
+            mkdir -p $out/nix-support
+            substituteAll "${bintools-wrapper}/add-flags.sh" $out/nix-support/add-flags.sh
+            substituteAll "${bintools-wrapper}/add-hardening.sh" $out/nix-support/add-hardening.sh
+            substituteAll "${bintools-wrapper}/../wrapper-common/utils.bash" $out/nix-support/utils.bash
+          done
+        '';
+      };
       c_rust = pkgs.rust-bin.fromRustupToolchainFile "${rustc_cranelift_backend}/rust-toolchain";
       rcb = pkgs.stdenv.mkDerivation {
         pname = "rustc_cranelift_backend";
@@ -146,7 +168,7 @@
 
       nativeBuildInputs = with pkgs; [
         pkg-config
-          mold
+        mold'
         rcb
       ];
       buildInputs = with pkgs; [