t_slist: include <stdexcept>

Change-Id: Ia639c2a36ed86c4e442d0d22952fadc68cf72679
std::out_of_range is not defined
Reviewed-on: http://review.couchbase.org/36606
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>