Also install the stubs within the binary distribution

Author: chadrik

src/cmake/pythonutils.cmake

@@ -156,7 +156,8 @@ macro (setup_python_module)
              RUNTIME DESTINATION ${PYTHON_SITE_DIR} COMPONENT user
              LIBRARY DESTINATION ${PYTHON_SITE_DIR} COMPONENT user)
 
-    install(FILES __init__.py DESTINATION ${PYTHON_SITE_DIR} COMPONENT user)
+    install (FILES __init__.py stubs/OpenImageIO-stubs/__init__.pyi stubs/OpenImageIO-stubs/py.typed
+             DESTINATION ${PYTHON_SITE_DIR} COMPONENT user)
 
 endmacro ()