root's home directory was moved to /root many years ago, so there's no
reason to keep this old link. This brings sh in line with csh, where
/.cshrc was removed in dcb65c5a94d4.
As a side-effect, since /.profile doesn't have the @config tag, this
prevents pkgbase upgrades from overwriting /root/.profile.
Relnotes: yes
PR: 289097