[libcxx][AIX] XFAIL tests enabled by locale.fr_FR.UTF-8

We missed the tests in the earlier XFAIL-ing because the locale.fr_FR.UTF-8
feature wasn't available, but since an upgrade these are now showing up
on the CI.

Differential Revision: https://reviews.llvm.org/D113791

GitOrigin-RevId: 4602f52d482c5752d6a4c13108f29f0be39598c8
5 files changed