[PATCH 0 of 1] util: remove unused realpath (issue4063)

[Christian Ebert]

Hi,

Currently the dead realpath code is just an accident waiting to happen.

A more defensive approach would be to re-apply it after fine-tuning.
>From my perspective util.realpath (posix.realpath) was alwasy broken on Darwin
under the circumstances I could test: Mac OS 10.5.8 and upwards, Python 2.5
and upwards. But - as I wrote in
http://www.selenic.com/pipermail/mercurial-devel/2011-October/035331.html
there must have been _some_ reason for util.realpath to exist.