`tu_WaitForFences` and `tu_GetFenceStatus` ended up using `ioctl` instead of
`safe_ioctl` and as a result were responsible for handling `EAGAIN`/`EINTR`
but they weren't handled correctly in wait calls which led to dropping the
wait if the thread received a signal without automatic syscall restarting on
release builds and an assertion due to `errorno` being `EINTR` on debug
builds.
This fixes early wait returns which would lead to UB or cause crashes due to
hitting debug assertions in Skyline Emulator.
Signed-off-by: Mark Collins <mark@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18031>
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