[clang] [Android] Drop workarounds for older Android API levels pre 23 (PR #161893)

[Brad Smith via cfe-commits]

brad0 wrote:

> Thank you very much for the accommodation here! I'm raising this internally, so we can figure out how to handle this on our end.
> 
> If possible, could we hold off on this until after the LLVM 22 release branch is cut (usually around mid-January)? That'll give us some extra time for this.

Ya, sure. I wasn't intending to commit this for at least a few months. All feedback and testing welcome.

https://github.com/llvm/llvm-project/pull/161893