meson: Switch default-locale default to C.UTF-8

We're already using C.UTF-8 as the default locale for nspawn. Let's
make the same change for the default-locale option instead of deciding
what to use based on the locale used by the host system. Users can
still override the locale using the default-locale option if needed.

meson.build

@@ -929,15 +929,6 @@ ntp_servers = get_option('ntp-servers')
 conf.set_quoted('NTP_SERVERS', ntp_servers)
 
 default_locale = get_option('default-locale')
-if default_locale == ''
-        if not meson.is_cross_build()
-                choose_default_locale_sh = find_program('tools/choose-default-locale.sh')
-                default_locale = run_command(choose_default_locale_sh,
-                                             check : true).stdout().strip()
-        else
-                default_locale = 'C.UTF-8'
-        endif
-endif
 conf.set_quoted('SYSTEMD_DEFAULT_LOCALE', default_locale)
 
 localegen_path = get_option('localegen-path')

meson_options.txt

@@ -300,7 +300,7 @@ option('default-kill-user-processes', type : 'boolean',
        description : 'the default value for KillUserProcesses= setting')
 option('gshadow', type : 'boolean',
        description : 'support for shadow group')
-option('default-locale', type : 'string', value : '',
+option('default-locale', type : 'string', value : 'C.UTF-8',
        description : 'default locale used when /etc/locale.conf does not exist')
 option('localegen-path', type : 'string', value : '',
        description : 'absolute path to the locale-gen binary in case the system is using locale-gen')

tools/choose-default-locale.sh

@@ -1,12 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: LGPL-2.1-or-later
-set -e
-
-# Fedora uses C.utf8 but Debian uses C.UTF-8
-if locale -a | grep -xq -E 'C\.(utf8|UTF-8)'; then
-    echo 'C.UTF-8'
-elif locale -a | grep -xqF 'en_US.utf8'; then
-    echo 'en_US.UTF-8'
-else
-    echo 'C'
-fi