message: Remove duplicate option start signs
  The generator_args function deliver the option with platform depend
  option signs.
diff: @@ -921,7 +921,7 @@ export abstract class CMakeDriver implements vscode.Disposable {
  .forEach(async ([key, value]) => build_env[key] = await expand.expandString(value, opts)));
  const args = ['--build', this.binaryDir, '--config', this.currentBuildType, '--target', target]
  - .concat(this.config.buildArgs, ['--'], generator_args, this.config.buildToolArgs);
  + .concat(this.config.buildArgs, generator_args, this.config.buildToolArgs);
  const expanded_args_promises
  = args.map(async (value: string) => expand.expandString(value, {...opts, envOverride: build_env}));
  const expanded_args = await Promise.all(expanded_args_promises) as string[];
  