[roll] Roll fuchsia [starnix] Test that futex_wait can be interrupted. If a thread waiting on a futex receives a signal that triggers a signal handler, and the signal disposition didn't set `SA_RESTART`, the futex syscall should return with a `EINTR` error number. This CL adds a test for that. The main thread sets up a signal handler for `SIGUSR1` that doesn't do anything, spawns the second thread and waits on a futex. The second thread blocks `SIGUSR1` on that thread, and sends a process-directed `SIGUSR1` every 100ms. The expected result is that the main thread is interrupted while waiting for the futex. Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1065248 Original-Revision: 4adee895372f6e78cf076528be5abf28699f9deb GitOrigin-RevId: 0a504b229a5e58f72a7b9ab034fb1f3e03970d69 Change-Id: I69fe8b07629d7ad5f24b9f6b5ef5ceb4bf899918
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