configs/: use the C.UTF-8 locale

The glibc 2.35-6 package ships with the C.UTF-8 locale included.
This means there is now a UTF-8 locale available by default and en_US.UTF-8, which requires editing /etc/locale.gen and running locale-gen, is not needed anymore.

Implements #175.

CHANGELOG.rst

@@ -8,12 +8,19 @@ Changelog
 Added
 -----
 
+- Configure the locale for the baseline profile to ``C.UTF-8`` so that a UTF-8 locale is used.
+
 Changed
 -------
 
+- Change the releng profile's locale from ``en_US.UTF-8`` to ``C.UTF-8``.
+
 Removed
 -------
 
+- Remove the custom pacman hook that ran ``locale-gen`` on glibc install from the releng profile. The used locale now
+  ships with the glibc package itself.
+
 [64] - 2022-05-30
 =================
 

configs/baseline/airootfs/etc/locale.conf

+LANG=C.UTF-8

configs/releng/airootfs/etc/locale.conf

-LANG=en_US.UTF-8
+LANG=C.UTF-8

configs/releng/airootfs/etc/pacman.d/hooks/40-locale-gen.hook

-# remove from airootfs!
-[Trigger]
-Operation = Install
-Type = Package
-Target = glibc
-
-[Action]
-Description = Uncommenting en_US.UTF-8 locale and running locale-gen...
-When = PostTransaction
-Depends = glibc
-Depends = sed
-Depends = sh
-Exec = /bin/sh -c "sed -i 's/#\(en_US\.UTF-8\)/\1/' /etc/locale.gen && locale-gen"