CMakeLists.txt: find python interpreter first
CMakeLists.txt: find python interpreter first

CMake documentation recommends ordering find_package(PythonInterp)
before find_package(PythonLibs) when both are called.

Change-Id: Ic09f40b999d446146f58c1e6dab2ba920d8821a5
Reviewed-by: Alexandru Croitor <8ffcaf561685ad82d027def0dc95a2702daba6ec@qt.io>

qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside