Fix formatting of output C++ toolchain for macOS.

Previously the generated `external/local_config_cc/BUILD` was a bit off,
which triggerred buildifier when trying to reuse it for a custom
CROSSTOOL.

Before:

```starlark
[
    cc_toolchain_config(
        name = (arch if arch != "armeabi-v7a" else "stub_armeabi-v7a"),
        compiler = "compiler",
        cpu = arch,
        cxx_builtin_include_directories = [        "/Applications/Xcode-11.7.0.app/Contents/Developer",
        "/Applications/Xcode-12.0.0.app/Contents/Developer",
        "/Applications/",],
        tool_paths_overrides = {},
    )
    for arch in OSX_TOOLS_ARCHS
]
```

After:

```starlark
[
    cc_toolchain_config(
        name = (arch if arch != "armeabi-v7a" else "stub_armeabi-v7a"),
        compiler = "compiler",
        cpu = arch,
        cxx_builtin_include_directories = [
            "/Applications/Xcode-11.7.0.app/Contents/Developer",
            "/Applications/Xcode-12.0.0.app/Contents/Developer",
            "/Applications/",
        ],
        tool_paths_overrides = {},
    )
    for arch in OSX_TOOLS_ARCHS
]
```

Tested by running `bazel sync --configure` and checking the contents of
`external/local_config_cc/BUILD`.

Closes #12157.

PiperOrigin-RevId: 335613727
2 files changed
tree: ac2a4c89dc31f6298563df40e3f75d13267bcf35
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEBASE.md
  15. CODEOWNERS
  16. combine_distfiles.py
  17. combine_distfiles_to_tar.sh
  18. compile.sh
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. distdir.bzl
  22. ISSUE_TEMPLATE.md
  23. LICENSE
  24. README.md
  25. WORKSPACE
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