Silence Clang 18 warning (#762)

The Clang 18 roll here https://github.com/flutter/engine/pull/45486 will
add a new warning like:

we get errors of the form:
```
../../third_party/json/include\nlohmann/json.hpp(5142,35): error: identifier '_json' preceded by whitespace in a literal operator declaration is deprecated [-Werror,-Wdeprecated-literal-operator]
 5142 | inline nlohmann::json operator "" _json(const char* s, std::size_t n)
      |                       ~~~~~~~~~~~~^~~~~
      |                       operator""_json
```

That is, Clang rejects `operator "" _a` unless spaces are removed. This
PR adds a flag to silence the warning util it is fixed upstream.
1 file changed
tree: 33396a43464c52a9b002fda994e179f97a12453b
  1. .github/
  2. build/
  3. build_overrides/
  4. gpu/
  5. tools/
  6. .clang-format
  7. .gitattributes
  8. .gitignore
  9. .gn
  10. .ycm_extra_conf.py
  11. AUTHORS
  12. BUILD.gn
  13. CODEOWNERS
  14. LICENSE
  15. README.md
README.md

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buildroot

Build environment for the Flutter engine

This repository is used by the flutter/engine repository. For instructions on how to use it, see that repository's CONTRIBUTING.md file.

To update your checkout to use the latest buildroot, run gclient sync.

To submit patches to this buildroot repository, create a branch, push to that branch, then submit a PR on GitHub for that branch.

To point the engine to a new version of buildroot after your patch is merged, update the buildroot hash in the engine's DEPS file.