os: don't poll fifos on Darwin
The Darwin kqueue implementation doesn't report any event when the last writer for a fifo is closed. Fixes #24164 Change-Id: Ic2c47018ef1284bf2e26379f8dd7646edaad4d05 Reviewed-on: https://go-review.googlesource.com/118566 Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org>
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