This follows what the output of make targets looks like, and reduces the
number of directories needed on the FTP server, since we now have only one
architecture with multiple machine types (i386, which has i386 and pc98),
but 3 machines with 9 architectures between them (powerpc, mips, and arm).
Requested by: kensmith, bz
Approved by: re(kensmith)
(e.g. powerpc64), this looks in a slightly different default path than now,
specifying both $MACHINE and $MACHINE_ARCH:
MIRROR/pub/FreeBSD/releases/`uname -p`/`uname -m`/`uname -r`
How to handle TBEMD properly probably merits some more discussion, but,
since no such 9.0-CURRENT distfiles exist at the moment, all existing
mirrors presently fail anyway.
