The darwin build fails and it's probably not particularly useful there.
utils.c:33:19: error: use of undeclared identifier 'CLOCK_MONOTONIC'
clock_gettime(CLOCK_MONOTONIC, &t);
/cc ZHF #45961
Negative reasoning like `allBut` is a bad idea with an open world of
platforms. Concretely, if we add a new, quite different sort of
platform, existing packages with `allBut` will claim they work on it
even though they probably won't.
