By using INSTALL_LINK instead of calling ln during install the files
end up in the METALOG file as well if we use -DNO_ROOT and will be
included in a disk image when using makefs with METALOG as the input.
The other file that was not included in METALOG was /var/db/services.db
which is now also included for -DNO_ROOT.
Approved By: brooks (mentor)
Differential Revision: https://reviews.freebsd.org/D15665
Now I know that there was talk of moving it to the release/Makefile or the
etc/Makefile, but I don't think it was ever decided where.
Reviewed by: phk
Submitted by: John Hay <jhay@mikom.csir.co.za>
