update glibc start files to 2.38

I went ahead and left the README.md file deleted because it had broken
git hashes. Better to use `git log -- lib/libc/glibc/` to find out the
patches.
2314051acaAndrew Kelley committed on 10/14/2023, 12:44:27 AMparent87b3e23
64 files changedLine totals unavailable