Log Message:
Update pkg_chk to 1.53.
    - Substitute default values for GREP, PKG_INFO, and SED at buildtime
    - Add -P dir, to set binary package dir
    - Remove the need for a copy of pkgsrc when using -b
    - List 'missing' packages at the end alog wwith Installed and Failed
    - Output various messages to stdout and to logfile (if active)
    - As ever, there are few problems that cannot be helped by
      adding another layer of abstraction