Fix locale_id for older versions of OS X (<= 10.11)
Fix locale_id for older versions of OS X (<= 10.11)

This fixes a regression introduced in https://github.com/jwilm/alacritty/pull/1087/files#diff-5ffadea12561d6964b05ac2a0b8e388fL33.
jwilm/alacritty,alacritty/alacritty,jwilm/alacritty,jwilm/alacritty,jwilm/alacritty,alacritty/alacritty