Purge two old time-zone lookup fallbacks

We used to need to consult /etc/timezone for the zone name back when
Debian, up to Jessie, used a copy of the zoneinfo file as
/etc/localtime, instead of a symlink.  Jessie's end of life is this
May, but Thiago reports that its gcc can't build Qt 5.14, so we may as
well remove this fall-back.  Newer versions of Debian use a symlink.

We used to need to consult /etc/sysconfig/clock for this information
back when ancient Red Hat distros copied zoneinfo to /etc/localtime
instead of symlinking, but Thiago believes that's now ancient history.
So, again, remove this old fallback.

Change-Id: I73cb40b926186b311dac6f00fe8743d37a9dfce5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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