update-test-path: Fix LD_LIBRARY_PATH setup

This script fails when LD_LIBRARY_PATH is not set before calling it and calling script has nounset option set.

Fixes: T8280

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

mentioned in merge request connman-pan-tethering!1 (closed)

mentioned in merge request connman-pan-network-access!1 (closed)

merged