Made it clean up in /sys/i386/boot after building and installing the
boot blocks.
Moved the cd ..; make install to be after the special case stuff for
sendmail.
Added the installation of tcpproto.cf as /etc/sendmail.cf
spwd.db that are created from the template master.passwd to src/etc so
that a build distribution can populate /etc correctly. This is a work
around until a better solution can be found.