[libc-commits] [libc] [libc][cmake] Tidy compiler includes (PR #66783)

[Guillaume Chatelet via libc-commits]

gchatelet wrote:

I've used `grep`, and cmake `--trace` and `--trace-expand` but I couldn't find where the first two include are coming from.
Anyways, it should be good enough for #66477

https://github.com/llvm/llvm-project/pull/66783