for both bootstrap and mkbinarykit. When this is done or the
platform fragment of bootstrap specifies an explicit fetch_cmd,
tnftp is not built.
Use /usr/bin/ftp by default on DragonFly 1.4 and later.
avoid conflicts with FreeBSD ports. Later versions use pkgsrc by default,
so use the more natural /var/db/pkg location and match the install CD
thereby.
difference on some platforms is an exercise left to the reader, but
the current pkgsrc convention is #!<program> without the space, so
this is if nothing else, a consistency fix.
Add a new flag to mkbinarykit that circumvents building a kit -- this
allows you to first run ./bootstrap and then just ./mkbinarykit so
you don't have to rebuild it again.
Minor cleanup (sort OPSYS)
