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] ``` See: https://jenkins.torproject.org/job/tor-ci-mingwcross-master-test/ARCHITECTURE=amd64,SUITE=stretch/lastBuild/console