tests: Restore sleep for ninja on HFS+ (macOS)
tests: Restore sleep for ninja on HFS+ (macOS)

QuLogic discovered that HFS+ only stores dates in uint32 seconds since
the epoch, so ninja cannot report sub-1s resolution timestamps there.
Sometime in the future Apple FS will become widely-available and we
will have to add a filesystem check at startup.

https://developer.apple.com/legacy/library/technotes/tn/tn1150.html#HFSPlusDates

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