Merge topic 'autogen-ninja-multi-config' into release-3.31

8a526f6a44 Autogen: Fix Ninja Multi-Config dependency graph regression
3cac48e8cd Autogen: Restore <target_name>_autogen_timestamp_deps target

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !10039