Rename `BKE_nla.h` to `BKE_nla.hh` and remove C-isms. No functional changes. Pull Request: https://projects.blender.org/blender/blender/pulls/127395
Rename `BKE_nla.h` to `BKE_nla.hh` and remove C-isms. No functional changes. Pull Request: https://projects.blender.org/blender/blender/pulls/127395