message: Make Shiboken2/PySide2 searches QUIET to avoid scary warnings
  * By default cmake will print huge scary warnings if the packages aren't
  available instead of silently continuing and letting us check, which is a bad
  default for optional packages.
diff: @@ -128,11 +128,8 @@ ExternalProject_Add(custom_swig
  BUILD_COMMAND ${GENERATOR_MAKE} > /dev/null 2>&1
  INSTALL_COMMAND ${GENERATOR_MAKE} install > /dev/null 2>&1)
  -# Lastly find PySide 2, optionally, for Qt5 Python bindings
  -list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}")
  -
  -find_package(Shiboken2)
  -find_package(PySide2)
  +find_package(Shiboken2 QUIET)
  +find_package(PySide2 QUIET)
  set(PYTHON_LINK "${PYTHON_LIBRARY}")
  