This makes it possible, on a system with /usr/{lib,share}/zoneinfo/,
to systematically run a command with TZ set to each system-supported
zone. For example, it can be used to verify that a corelib/time/ test
passes regardless of the valid setting of TZ.
Change-Id: I6ea9a64d8bcb745aea80ab9ae431602d3e3265a1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
