Use regular stat when resolving a symlink

Summary: Before f3b0f220a78d4e5a5b94b46e931779d755ac19ce when getting the details of a symlink a regular QT_STAT mimicking stat() was used.

Test Plan: ctest

Reviewers: dfaure, Frameworks

Reviewed By: dfaure

Subscribers: bcooksley, kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D20694