[libc++] Add a libc++ configuration that does not support localization

When porting libc++ to embedded systems, it can be useful to drop support
for localization, which these systems don't implement or care about.

Differential Revision: https://reviews.llvm.org/D90072

GitOrigin-RevId: 88ffc72717c3b66b185caf8efcb0c19f32c355cd
117 files changed