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

[Louis Dionne via llvm-commits]

https://github.com/ldionne approved this pull request.

Got it, thanks for explaining. Don't make any changes to `__cxx03/*`, these headers are frozen and shouldn't be modified (at least, not right now).

LGTM with green CI. Let's also give some time for @philnik777 to chime in again, but I think this should be pretty uncontroversial. Thanks a lot for the cleanup, this is appreciated!

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