repo-*: allow use of readlink or realpath

Linux coreutils provides readlink, and BSD systems tend to have realpath
available. Both commands provide similar functionality but of course have
different names. Add a check for either and use what is available.

While doing this, also unify some of the differences that have cropped up
between repo-add and repo-remove.

Signed-off-by: Dan McGee <dan@archlinux.org>

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