build: replace mold with the wild linker

nix/package.nix

@@ -2,12 +2,20 @@
   lib,
   rustPlatform,
   llvm,
+  clang,
+  wild,
 }: let
   pname = "microfetch";
   toml = (lib.importTOML ../Cargo.toml).workspace.package;
   inherit (toml) version;
+  inherit (llvm) stdenv;
+
+  # wild + clang are only used on Linux tier-1 arches
+  hasWild =
+    stdenv.hostPlatform.isLinux
+    && (stdenv.hostPlatform.isx86_64 || stdenv.hostPlatform.isAarch64);
 in
-  rustPlatform.buildRustPackage.override {inherit (llvm) stdenv;} (finalAttrs: {
+  rustPlatform.buildRustPackage.override {inherit stdenv;} (finalAttrs: {
     __structuredAttrs = true;
 
     inherit pname version;
@@ -21,12 +29,17 @@ in
           (s + /.cargo)
           (s + /crates)
           (s + /microfetch)
-          (s + /scripts/ld-wrapper)
           (s + /Cargo.lock)
           (s + /Cargo.toml)
         ];
       };
 
+    nativeBuildInputs = lib.optionals hasWild [wild clang];
+
+    env = lib.optionalAttrs hasWild {
+      RUSTFLAGS = "-Cforce-unwind-tables=no -Clinker=${clang}/bin/clang -Clink-arg=--ld-path=${wild}/bin/wild";
+    };
+
     cargoLock.lockFile = "${finalAttrs.src}/Cargo.lock";
     enableParallelBuilding = true;
     buildNoDefaultFeatures = true;

nix/shell.nix

@@ -2,7 +2,7 @@
   mkShell,
   cargo,
   rustc,
-  mold,
+  wild,
   clang,
   rust-analyzer,
   rustfmt,
@@ -16,7 +16,7 @@ mkShell {
   nativeBuildInputs = [
     cargo
     rustc
-    mold
+    wild
     clang
 
     rust-analyzer