Connect bsdcpio up to the build.
Connect bsdcpio up to the build.

Starting now, there are two cpio programs in the base system:
  /usr/bin/gcpio  - GNU cpio
  /usr/bin/bsdcpio - bsdcpio

In addition, there is a symlink:
  /usr/bin/cpio -> /usr/bin/gcpio (default)
  /usr/bin/cpio -> /usr/bin/bsdcpio (WITH_BSDCPIO)

In particular, WITH_BSDCPIO only controls the
symlink; bsdcpio is always built regardless.

Unless there are objections or problems, I intend:
  * to make /usr/bin/bsdcpio available in 7.1
  * to have /usr/bin/cpio default to bsdcpio in 8.0
    (WITH_GCPIO will be an option instead of WITH_BSDCPIO)
  * to leave /usr/bin/gcpio in the tree until 9.0

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