PySide Build: find qtpaths before SetupRunner.run_setup()

- 'qtpaths' needs to be known while setting up the corresponding
  setup.py command to ignore the pyside qt wrapper tools whose qt tool
  does not exist
- This is an extension to 43109854a2966afe2e0cf29961157a6f54d5775c.
  The aforementioned patch led to qtpaths being found 2 times, once
  inside CommandMixin class and also much before that inside
  SetupRunner.run_setup(). This redundancy is now removed by moving
  the finding of OPTION['QTPATHS'] outside the mixin and before
  CommandMixin object of the command being run is initialized
- the help commands, build_rst_docs and cross compilation command
  should not complain about qtpaths anymore
- fixed cross compilation build

Task-number: PYSIDE-2195
Change-Id: I862baf954dea0a3bdaf5ddf411f119178b457c42
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

0 files changed, 0 insertions, 0 deletions