In preparation for logging metadata about each filesystem object
refactor the link section of distrib-dirs to alwasy install to a full
path (the link contents remain relative as they should).

Eliminate the use of the "rm -r[f] <foo>; ln -s <bar> <foo>" pattern in
favor of "ln -sf <bar> <foo>". None of these links could be directories
on a system installed in the last decade.

Sponsored by: DARPA, AFRL
Reviewed by: mtree