* Reduce diffs to RELENG_4 by specifying a full path to sysctl

* Adjust a little whitespace
* Make the distrib-dirs/mtree on DESTDIR conditional on user
  actually specifying a DESTDIR. This seemed like a safe
  way to get the right directories and permissions in the
  installed tree since 'make installworld' does the same
  thing, but in practice too many people have custom hacks
  that we should leave unmolested. Still need to find a way
  to deal with 'install -d' and permissions on nonexistent
  directories in the middle of the path, but this is at
  least no worse that it was before.

PR:		bin/22661

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