locale_gen: enable tests for Arch Linux, make sure they don't even try to run on RHEL and Fedora VMs (#9796)
Enable locale_gen tests for Arch Linux, make sure they don't even try to run on RHEL and Fedora VMs.
(cherry picked from commit 217a18839d)
Co-authored-by: Felix Fontein <felix@fontein.de>
* locale_gen: fix
* test working with C.UTF-8
* working with locale eo
* handle C.UTF-8 edge cases
* grammatic pedantism
* add changelog frag
* add doc about specific OS support
* update changelog frag