bintrans: disable argument permutation for qp and base64

Err on the side of caution and revert to the BSD-style getopt(3)
behavior for argument processing, as it's harder to go back and it's
not clear that this was strictly intentional.

This is the difference between allowing base64 /COPYRIGHT -w 80 and
forcing base64 -w 80 /COPYRIGHT.

Reviewed by: emaste, pstef

(cherry picked from commit d8fd551438706b3766da23e72ef077945ba43cd3)