util/time test fails on OpenBSD
The Pixelminers buildbot shows failures on the util/time test, see https://buildbot.pixelminers.net/builders/OpenBSD/builds/970/steps/shell_3/logs/stdio ``` util/time: FAIL src/test/test_util.c:302: assert(LONG_MAX OP_EQ tv_udiff(&start, &end)): 2147483647 vs -6005000 [time FAILED] ```
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