pyside2 cmake code does not handle crossbuild while generating pyi files.
(stub files for type checker).
From now, disable their generation.

--- a/sources/pyside2/cmake/Macros/PySideModules.cmake
+++ b/sources/pyside2/cmake/Macros/PySideModules.cmake
@@ -201,18 +201,24 @@
     endif()
 
     # Add target to generate pyi file, which depends on the module target.
+    if(NOT CMAKE_CROSSCOMPILING)
     add_custom_target("${module_NAME}_pyi" ALL
                       COMMAND ${CMAKE_COMMAND} -E env ${ld_prefix}
                       "${SHIBOKEN_PYTHON_INTERPRETER}"
                       "${CMAKE_CURRENT_SOURCE_DIR}/../support/generate_pyi.py" ${generate_pyi_options})
     add_dependencies("${module_NAME}_pyi" ${module_NAME})
+    else()
+      message(STATUS "crossbuild: disable generation of ${module_NAME}_pyi")
+    endif()
 
     # install
     install(TARGETS ${module_NAME} LIBRARY DESTINATION "${PYTHON_SITE_PACKAGES}/PySide2")
 
+    if(NOT CMAKE_CROSSCOMPILING)
     file(GLOB hinting_stub_files RELATIVE "${CMAKE_CURRENT_BINARY_DIR}/PySide2" "${CMAKE_CURRENT_BINARY_DIR}/PySide2/*.pyi")
     install(FILES ${hinting_stub_files}
             DESTINATION "${PYTHON_SITE_PACKAGES}/PySide2")
+    endif()
 
     install(FILES ${CMAKE_CURRENT_BINARY_DIR}/PySide2/${module_NAME}/pyside2_${lower_module_name}_python.h
             DESTINATION include/PySide2${pyside2_SUFFIX}/${module_NAME}/)