Remove building of Unicode C dependencies for Platform which are now in src/cdeps
This cleanup is possible after https://gitlab.science.ru.nl/clean-and-itasks/clean-platform/-/merge_requests/380, which moves the Unicode C dependencies to src/cdeps.
This cleanup is possible after https://gitlab.science.ru.nl/clean-and-itasks/clean-platform/-/merge_requests/380, which moves the Unicode C dependencies to src/cdeps.