Use the C.UTF-8 locale for guix-daemon and guix-publish.

https://bugs.debian.org/1012536

Index: guix/etc/guix-daemon.service.in
===================================================================
--- guix.orig/etc/guix-daemon.service.in
+++ guix/etc/guix-daemon.service.in
@@ -8,7 +8,7 @@ Description=Build daemon for GNU Guix
 [Service]
 ExecStart=/usr/bin/guix-daemon \
     --build-users-group=_guixbuild --discover=no
-Environment='GUIX_LOCPATH=@localstatedir@/guix/profiles/per-user/root/guix-profile/lib/locale' LC_ALL=en_US.utf8
+Environment=LC_ALL=C.UTF-8
 StandardOutput=syslog
 StandardError=syslog
 
Index: guix/etc/init.d/guix-daemon.in
===================================================================
--- guix.orig/etc/init.d/guix-daemon.in
+++ guix/etc/init.d/guix-daemon.in
@@ -35,8 +35,7 @@ start)
       -a \
       -e "/var/log/guix-daemon-stderr.log" \
       -o "/var/log/guix-daemon-stdout.log" \
-      -E GUIX_LOCPATH=@localstatedir@/guix/profiles/per-user/root/guix-profile/lib/locale \
-      -E LC_ALL=en_US.utf8 \
+      -E LC_ALL=C.UTF-8 \
       -p "/var/run/guix-daemon.pid" \
       /usr/bin/guix-daemon \
       --build-users-group=_guixbuild --discover=no
Index: guix/etc/openrc/guix-daemon.in
===================================================================
--- guix.orig/etc/openrc/guix-daemon.in
+++ guix/etc/openrc/guix-daemon.in
@@ -17,8 +17,7 @@
 # You should have received a copy of the GNU General Public License
 # along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
-export GUIX_LOCPATH=@localstatedir@/guix/profiles/per-user/root/guix-profile/lib/locale
-export LC_ALL=en_US.utf8
+export LC_ALL=C.UTF-8
 command="/usr/bin/guix-daemon"
 command_args="--build-users-group=_guixbuild --discover=no"
 command_background="yes"
Index: guix/etc/guix-publish.service.in
===================================================================
--- guix.orig/etc/guix-publish.service.in
+++ guix/etc/guix-publish.service.in
@@ -10,7 +10,7 @@ After=guix-daemon.service
 
 [Service]
 ExecStart=/usr/bin/guix publish --user=nobody --port=8181
-Environment='GUIX_LOCPATH=@localstatedir@/guix/profiles/per-user/root/guix-profile/lib/locale' LC_ALL=en_US.utf8
+Environment=LC_ALL=C.UTF-8
 StandardOutput=syslog
 StandardError=syslog
 
