Append arbitrary args instead of prepending.

[jameshilliard]

Summary of changes

Restore original argument append behavior which was changed in #4079.

Fixes:

error: option --dist-dir not recognized

ERROR Backend subprocess exited when trying to invoke build_wheel

Pull Request Checklist

• Changes have tests
• News fragment added in newsfragments/.
  (See documentation for details)

[jameshilliard]

Closing in favor of #4218.

[abravalheri]

Thank you very much @jameshilliard for working on this.

Would you like to add a regression test so that we don't accidentally break the use case in the future?

[jameshilliard]

Would you like to add a regression test so that we don't accidentally break the use case in the future?

Test added that should catch this issue.

[abravalheri]

Thank you very much @jameshilliard!