Fix _realpath()

Apertis-tests for geoclue fails with the following error:

/usr/share/chaiwala-tests/geoclue/automated/run-test.sh: 260: cd: can't cd to /usr/share/chaiwala-tests/geoclue/automated/../../resources

In this case /usr/share/chaiwala-tests/geoclue/automated is a link to ../../../lib/apertis-tests/geoclue/automated.

Force cd to resolve symbolic links to their values.

Signed-off-by: Frédéric Danis frederic.danis@collabora.com