util/time test failure on Jenkins
Our 'util/time' test fails on our tor-ci-mingwcross-master-test builder with:
util/time: Mar 27 13:29:43.773 [warn] tor_gmtime_r(): Bug: gmtime(-1) failed with error Invalid argument: Rounding up to 1970 (on Tor 0.4.1.0-alpha-dev )
[time FAILED]