[compiler-rt] [sanitizer_common] Remove reference to obsolete termio ioctls (PR #138822)

[Thurston Dang via llvm-commits]

https://github.com/thurstond requested changes to this pull request.

I believe this issue was solved by [trcrsired](https://github.com/trcrsired) in https://github.com/llvm/llvm-project/pull/149140

Note that unconditionally deleting these constants would cause a sanitizer regressions on PowerPC (and possibly some libcs other than glibc).

https://github.com/llvm/llvm-project/pull/138822