setup.py: Don't add the Qt prefix dir to PATH env var before building

Modifying PATH influences which packages are found by CMake's
find_package, as well as which binaries are available to execute
during the CMake build phase.

Instead of relying on PATH, we should rely on passing the detected Qt
prefix dir to CMAKE_PREFIX_PATH.

This makes the build process more robust against differences
in environment variables, as well as ensuring reproducibility
when incrementally rebuilding a project manually without going
through setup.py.

Pick-to: 6.2
Task-number: PYSIDE-1033
Change-Id: I9c36d9924b82cb1133c44f4ef44ca785bbf7e862
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Christian Tismer <tismer@stackless.com>

0 files changed, 0 insertions, 0 deletions