std: Fix a flaky test on OSX 10.10 #18985
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This test was somewhat sketchy already with a `loop` around `write`, so this just adds some explicit synchronization to only call `write` once and guarantee that the error happens. Closes rust-lang#18900
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This test was somewhat sketchy already with a
looparoundwrite, so thisjust adds some explicit synchronization to only call
writeonce and guaranteethat the error happens.
Closes #18900