Initially I thought using the second precision time() function is good enough,
but to make t/113-urgent.t considerably faster (>2s vs. 0.08s), we put in a
little more effort and use gettimeofday. Otherwise, this test blocks the whole
testsuite from completing much faster on modern machines :).
eval 'package foo; use strict;' enables strict within eval, it does
not leak into the surrounding scope.
Also fix various warnings/compile errors found due to now enabled
strict and warnings.
