Pull up following revision(s) (requested by snj in ticket #742):

etc/root/dot.profile: revision 1.30
etc/skel/dot.profile: revision 1.10
etc/login.conf: revision 1.7
etc/root/dot.cshrc: revision 1.27
share/man/man7/hier.7: revision 1.129 (patch)
etc/man.conf: revision 1.37
etc/skel/dot.cshrc: revision 1.8

/usr/X11R6 has been empty on most NetBSD installations since 2008,
and the last few straggling ports dumped it in 2015.  It's time to
prune references to /usr/X11R6 from our config files.

remove reference to /usr/X11R6

(martin)