`<ciso646>` is deprecated in C++17, and now GCC 15 has started to complain, so include an upstream commit that fixes this. Pull Request: https://projects.blender.org/blender/blender/pulls/139417
`<ciso646>` is deprecated in C++17, and now GCC 15 has started to complain, so include an upstream commit that fixes this. Pull Request: https://projects.blender.org/blender/blender/pulls/139417