[compiler-rt] [sanitizer] Remove usage of termios ioctl constants on Linux (PR #149140)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> @thurstond can you make ci run now? if it passes then please merge it.
> 
> plus also need to cherry pick to update release branches for llvm21, llvm20, llvm 19

llvm 19.x no longer gets new minor releases.

For llvm 20.x, llvm 20.1.8 was supposed to be the last minor release https://discourse.llvm.org/t/llvm-20-1-8-plans/87207
However, given the build breakage with new glibc we should consider making another one...

https://github.com/llvm/llvm-project/pull/149140