turnip: fence import/export
This shares code between semaphores/fences to add support for fence import/export (ImportFenceFdKHR/GetFenceFdKHR)
(first 5 commits from !6683 (merged))
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This shares code between semaphores/fences to add support for fence import/export (ImportFenceFdKHR/GetFenceFdKHR)
(first 5 commits from !6683 (merged))