message: [vcpkg-export] correctly handle --7zip option
diff: @@ -191,7 +191,7 @@ namespace vcpkg::Commands::Export
  const bool zip = options.find(OPTION_ZIP) != options.cend();
  const bool _7zip = options.find(OPTION_7ZIP) != options.cend();
  - Checks::check_exit(VCPKG_LINE_INFO, raw || nuget || zip,
  + Checks::check_exit(VCPKG_LINE_INFO, raw || nuget || zip || _7zip,
  "Must provide at least one of the following options: --raw --nuget --zip --7zip");
  // create the plan
  