Add missing rustc binaries to rustc_lib filegroup

Adds `rust-objcopy` and `wasm-component-ld` to the rustc_lib filegroup
in repository_utils.bzl. These binaries are present in rustc 1.90.0+
distributions but were not declared in the filegroup.

On Windows, Bazel copies files into the sandbox rather than symlinking,
so only explicitly listed files are available. This caused wasm32-wasip2
builds to fail with "linker 'wasm-component-ld.exe' not found".

On Linux/macOS, the issue was masked by symlink-based sandboxing which
allowed access to unlisted files in the same directory.

Author: avrabe

rust/private/repository_utils.bzl

@@ -47,6 +47,8 @@ filegroup(
             "lib/rustlib/{target_triple}/codegen-backends/*{dylib_ext}",
             "lib/rustlib/{target_triple}/bin/gcc-ld/*",
             "lib/rustlib/{target_triple}/bin/rust-lld{binary_ext}",
+            "lib/rustlib/{target_triple}/bin/rust-objcopy{binary_ext}",
+            "lib/rustlib/{target_triple}/bin/wasm-component-ld{binary_ext}",
             "lib/rustlib/{target_triple}/lib/*{dylib_ext}*",
             "lib/rustlib/{target_triple}/lib/*.rmeta",
         ],