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This small PR adds a default feature `schur` to control the `SCHUR_SPECIALIZATIONS` option in Ceres. It remains on by default. As described briefly in the [documentation](http://ceres-solver.org/installation.html#options-controlling-ceres-configuration), `SCHUR_SPECIALIZATIONS` enables some template specializations which improve runtime performance of the `SPARSE_SCHUR` solver, but it requires a large number of explicit instantiations and generates large object files—large enough to require `/bigobj` in MSVC. This can cause issues with some compilers particularly in constrained environments. - [x] Changes comply with the [maintainer guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md). - [ ] ~~SHA512s are updated for each updated download.~~ - [ ] ~~The "supports" clause reflects platforms that may be fixed by this new version.~~ - [ ] ~~Any fixed [CI baseline](https://github.com/microsoft/vcpkg/blob/master/scripts/ci.baseline.txt) entries are removed from that file.~~ - [ ] ~~Any patches that are no longer applied are deleted from the port's directory.~~ - [x] The version database is fixed by rerunning `./vcpkg x-add-version --all` and committing the result. - [x] Only one version is added to each modified port's versions file.