Reorder %pyproject_buildrequires arguments for a nicer usage string
    
    Before:
    
        usage: %pyproject_buildrequires [-w] [-R] [-e TOXENVS] [-t] [-x EXTRAS] [-N] [REQUIREMENTS.TXT ...]
    
    After:
    
        usage: %pyproject_buildrequires [-x EXTRAS] [-t] [-e TOXENVS] [-w] [-R] [-N] [REQUIREMENTS.TXT ...]
    
    The order was determined as:
    
        0. suppressed options
        1. extras, the easiest way to specify test deps (x)
        2. tox related options (te)
        3. build wheel, as it is provisional (w)
        4. "disablers" (RN)
        5. varargs are always listed last
    
    Previous order was pretty much random.