[libc-commits] [libc] [libc] rename newhdrgen to just hdrgen (PR #118545)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

> Probably going to sit on this for today to ensure that #117220 sticks. If #117220 has to be reverted, no point landing more patches on top.

#118558 as an example

https://github.com/llvm/llvm-project/pull/118545