Fix inclusion of wasm-component-ld in dist artifacts

This is another accidental omission from rust-lang#126967 (in addition
to rust-lang#127867) which fixes an issue where `wasm-component-ld` isn't
distributed via rustup just yet because while it's present in the
sysroot it's not present in the tarballs.

src/bootstrap/src/core/build_steps/dist.rs

@@ -472,6 +472,11 @@ impl Step for Rustc {
                     );
                 }
             }
+            if builder.build_wasm_component_ld() {
+                let src_dir = builder.sysroot_libdir(compiler, host).parent().unwrap().join("bin");
+                let ld = exe("wasm-component-ld", compiler.host);
+                builder.copy_link(&src_dir.join(&ld), &dst_dir.join(&ld));
+            }
 
             // Man pages
             t!(fs::create_dir_all(image.join("share/man/man1")));