Make the sceKernelSetEventFlag() test more stable.

1us just gives it a chance to cycle...
Update rtc test to account for 24-hour clock.

Days don't have 12 hours, they have 24.
Clean up some output in the alarm tests.
Oops, rtc/arithmetic and rtc/convert were old.
Merge pull request #157 from unknownbrackets/cleanup

Small cleanup to event flag and rtc tests