Build Pyside2 against Qt 5.7 and higher

CMake Error at .../qt-57/qtbase/lib/cmake/Qt5Multimedia/Qt5MultimediaConfig.cmake:15 (message):
  The imported target "Qt5::Multimedia" references the file

     ".../qt-57/qtbase/plugins/playlistformats/libqtmultimedia_m3u.so"

  but this file does not exist.  Possible reasons include:

  * The file was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and contained

     ".../qt-57/qtbase/lib/cmake/Qt5Multimedia/Qt5Multimedia_QM3uPlaylistPlugin.cmae"

  but not all the files it references.

Call Stack (most recent call first):
  .../qt-57/qtbase/lib/cmake/Qt5Multimedia/Qt5MultimediaConfig.cmake:133 (_qt5_Multmedia_check_file_exists)
  .../qt-57/qtbase/lib/cmake/Qt5Multimedia/Qt5Multimedia_QM3uPlaylistPlugin.cmake:4(_populate_Multimedia_plugin_properties)
  .../qt-57/qtbase/lib/cmake/Qt5Multimedia/Qt5MultimediaConfig.cmake:141 (include)
  cmake/Macros/FindQt5Extra.cmake:7 (find_package)
  CMakeLists.txt:72 (include)

-- Configuring incomplete, errors occurred!