[3.6] bpo-30225: Fix is_valid_fd() on macOS Tiger (#1443) #1449
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is_valid_fd() now uses fstat() instead of dup() on macOS to return 0
on a pipe when the other side of the pipe is closed. fstat() fails
with EBADF in that case, whereas dup() succeed.
(cherry picked from commit 1c4670e)