[libc-commits] [libc] [libc] Remove obsolete LIBC_HAS_BUILTIN macro (PR #86554)

[Joseph Huber via libc-commits]

jhuber6 wrote:

> But `7.4.0` does not support `-std=c++20` anyway (which is added somewhere in our codebase)

Yeah, what I mean is that there was a handful of files that it included which didn't exercise anything GCC 7.4 didn't support. We have C++20 elsewhere, but not in the code path that `printf` or `rpc.h` take.

https://github.com/llvm/llvm-project/pull/86554