[libcxx] [llvm] Remove workarounds for NDK versions before 2017's r16. (PR #148879)

[Louis Dionne via llvm-commits]

ldionne wrote:

> 
> ```
> #  elif defined(__linux__)
> #    include <__locale_dir/support/linux.h>
> ```
> 
> already in the file is the expected path for Android (since we'll already have been taking that anyway!).

If Android is already taking the `__linux__` path, then IMO this change makes sense as-is.

https://github.com/llvm/llvm-project/pull/148879