qmake sets wrong rpath for examples outside of qtbase

This assumes an in-source build of Qt with the following configure options (on Linux):

-confirm-license -developer-build -opensource -debug -nomake tests -nomake examples -silent

Using the mapviewer example in qtlocation/examples/location/mapviewer, the rpath is not correctly set by qmake. It is set to

>Library runpath: [$ORIGIN/../../../lib]

This translated to qtlocation/lib which is incorrect.

Every example (outside of qtbase) that sets target.path is broken because if the wrong rpath.

The patch that introduced this bug was https://codereview.qt-project.org/#/c/121399/