Add *.rmeta to rustc_lib rule (#3290)

It is already possible to download rustc-dev component when configuring
the rust toolchain:
```
rust.toolchain(
    edition = "2021",
    dev_components = True, # <<<----
    versions = [
        "nightly/2024-11-22",
    ],
)
```
rustc-dev component contains many rmeta files:

```
.
├── lib
│   └── rustlib
│       ├── aarch64-apple-darwin
│       │   └── lib
...
│       │       ├── librustc_ast_ir-bceb4101f84f6e22.rmeta
│       │       ├── librustc_ast_lowering-746f02f99c608c8b.rmeta
│       │       ├── librustc_ast_passes-f4f030429e2f817e.rmeta
│       │       ├── librustc_ast_pretty-f6791eb50adc110c.rmeta
│       │       ├── librustc_ast-cec2ef74e07d23e5.rmeta
│       │       ├── librustc_attr-2aa44e3a7f3d72c2.rmeta
│       │       ├── librustc_baked_icu_data-113883b3d0ba511c.rmeta
│       │       ├── librustc_borrowck-30a7df7b30f832e1.rmeta
...
```


However, these rmeta files aren't symlinked into rustc sysroot.

This PR adds rmeta files into rustc sysroot.

Co-authored-by: UebelAndre <github@uebelandre.com>

Author: PixelDust22

rust/private/repository_utils.bzl

@@ -46,6 +46,7 @@ filegroup(
             "lib/rustlib/{target_triple}/codegen-backends/*{dylib_ext}",
             "lib/rustlib/{target_triple}/bin/rust-lld{binary_ext}",
             "lib/rustlib/{target_triple}/lib/*{dylib_ext}*",
+            "lib/rustlib/{target_triple}/lib/*.rmeta",
         ],
         allow_empty = True,
     ),