Log Message:
gettext*: update to 0.21.1

Version 0.21.1 - October 2022

* Runtime behaviour:
  - On AIX, locale names with a script or with an uppercase language are now
    supported.
    For example, sr_Cyrl_RS.UTF-8 is treated like sr_RS.UTF-8@cyrillic, and
    EN_US.UTF-8 is treated like en_US.UTF-8.

* The base Unicode standard is now updated to 14.0.0.

* Portability:
  - Building on macOS 11/arm64 is now supported.
  - Building on Linux/powerpc64le with glibc ≥ 2.35 is now supported.