Add one more method to get system timezone
Add one more method to get system timezone

Some programs (like KDE system settings) makes /etc/localtime hardlink
instead of symlink. Handle this case. Hopefully there will be less and
less such applications...

woju/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin