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a5510a5430
[illumos] use pipe2 to create anonymous pipes pipe2 allows the newly-created pipe to atomically be CLOEXEC. pipe2 was added to illumos a long time ago: https://github.com/illumos/illumos-gate/commit/5dbfd19ad5fcc2b779f40f80fa05c1bd28fd0b4e. I've verified that this change passes all of std's tests on illumos.