Relax validation of --global-option in build_meta

In `pip` docs, the following example is mentioned:

> python -m pip wheel --global-option bdist_ext --global-option -DFOO wheel

Since both `--global-option` and `--build-option` are supposed to be
compatible with `pip` options, we should not prevent this abuse...
(Although it is still error prone and the user is responsible for
understanding in detail what is going on how this accidentally works).

setuptools/build_meta.py

@@ -185,11 +185,6 @@ def _get_config(self, key: str, config_settings: _ConfigSettings) -> List[str]:
  opts = cfg.get(key) or []
  return shlex.split(opts) if isinstance(opts, str) else opts
 
- def _valid_global_options(self):
- """Global options accepted by setuptools (e.g. quiet or verbose)."""
- options = (opt[:2] for opt in setuptools.dist.Distribution.global_options)
- return {flag for long_and_short in options for flag in long_and_short if flag}
-
  def _global_args(self, config_settings: _ConfigSettings) -> Iterator[str]:
  """
  Let the user specify ``verbose`` or ``quiet`` + escape hatch via
@@ -220,9 +215,7 @@ def _global_args(self, config_settings: _ConfigSettings) -> Iterator[str]:
  level = str(cfg.get("quiet") or cfg.get("--quiet") or "1")
  yield ("-v" if level.lower() in falsey else "-q")
 
- valid = self._valid_global_options()
- args = self._get_config("--global-option", config_settings)
- yield from (arg for arg in args if arg.strip("-") in valid)
+ yield from self._get_config("--global-option", config_settings)
 
  def __dist_info_args(self, config_settings: _ConfigSettings) -> Iterator[str]:
  """