The current cpio does not handle the format names used by our old cpio.
This may break some scripts for users, and it does causes some problems
for pkgsrc (see PR 19140)

Any objection to adding the old format names too? i.e. to let

       bin = bcpio
       newc = sv4cpio
       crc = sv4crc

(after verifying that they really correspond to the same formats...)

   /Krister