[llvm] [libc][bazel] simplify type_traits with glob (PR #94079)

[Jordan Rupprecht via llvm-commits]

rupprecht wrote:

> I know in CMake globs are problematic because adding a new file to the directory doesn't trigger a rebuild. However I'm assuming Bazel doesn't carry the same limitations and it's probably not an issue for headers.

Yes, this is fine. Bazel will pick up new *.h glob matches.

https://github.com/llvm/llvm-project/pull/94079