Fixup for avoid timezones being symlinks to symlinks
Having timezones that are symlinks to symlinks isn't compatible with the
expectations of the C++20 standard. When chrono::locate_zone finds a
link, it expects its target to be a zone, not another link.
Also fix Asia/Chungking symlink that was masked by debian/rules not
corretly creating symlinks to symlinks in some cases. See commit
b059a4521b3c ("d/rules: Support creating symlinks pointing to
symlinks").
Having timezones that are symlinks to symlinks isn't compatible with the
expectations of the C++20 standard. When chrono::locate_zone finds a
link, it expects its target to be a zone, not another link.
