[gcc r15-10201] Update ChangeLog and version files for release

https://gcc.gnu.org/g:5115c7e447fc07457443df874bf57840e8316d5f commit r15-10201-g5115c7e447fc07457443df874bf57840e8316d5f Author: Richard Biener Date: Fri Aug 8 06:52:36 2025 + Update ChangeLog and version files for release Diff: --- ChangeLog | 4 c++too

[gcc r13-9643] libstdc++/112351 - deal with __gthread_once failure during locale init

https://gcc.gnu.org/g:351ac78e48fa897080cf8bbb71618df9c428ad30 commit r13-9643-g351ac78e48fa897080cf8bbb71618df9c428ad30 Author: Richard Biener Date: Mon Nov 6 11:31:40 2023 +0100 libstdc++/112351 - deal with __gthread_once failure during locale init The following makes the C++98