timezone: Add a command line utility to set the system time zone

Author: https://github.com/trflynn89
Commit: 6057a2ca30
Pull-request: https://github.com/SerenityOS/serenity/pull/12026
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/linusg

Meta/build-root-filesystem.sh

@@ -101,6 +101,10 @@ if [ -f mnt/bin/utmpupdate ]; then
     chown 0:$utmp_gid mnt/bin/utmpupdate
     chmod 2755 mnt/bin/utmpupdate
 fi
+if [ -f mnt/bin/timezone ]; then
+    chown 0:$phys_gid mnt/bin/timezone
+    chmod 4750 mnt/bin/timezone
+fi
 if [ -f mnt/usr/Tests/Kernel/TestMemoryDeviceMmap ]; then
     chown 0:0 mnt/usr/Tests/Kernel/TestMemoryDeviceMmap
     chmod 4755 mnt/usr/Tests/Kernel/TestMemoryDeviceMmap