[libc-commits] [libc] [libc] Set correct symbol visibility for baremetal build (PR #180486)

[Joseph Huber via libc-commits]

jhuber6 wrote:

> We should consider setting these options unconditionally for all platforms.

I had a PR that did that at some point but the preferred solution was `LIBC_NAMESPACE_DECL` with `hidden` on the namespace. https://github.com/llvm/llvm-project/pull/97123

https://github.com/llvm/llvm-project/pull/180486