tests/posix_sleep: fix for invalid RTT configurations [backport 2021.01] #15876
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Backport of #15794
Contribution description
While testing RIOT-OS/Release-Specs#202 I found that
posix_sleep
was failing because of invalid RTT configurations. The proper fix is different than the one proposed here, I think it would mean adding a feature, but for a realease backport this is IMO the smallest change.Testing procedure
Test on
iotab-m3
now passes same for anykinetis
orefm32
BOARD
.