[ruby-core:113714] [Ruby master Bug#19700] TestProcess#test_execopts_redirect_open_fifo_interrupt_print is flaky on macOS

Issue #19700 has been reported by kjtsanaktsidis (KJ Tsanaktsidis).

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Bug #19700: TestProcess#test_execopts_redirect_open_fifo_interrupt_print is flaky on macOS
https://bugs.ruby-lang.org/issues/19700

* Author: kjtsanaktsidis (KJ Tsanaktsidis)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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The test `TestProcess#test_execopts_redirect_open_fifo_interrupt_print` in `test_process.rb` is flaky on macOS for me. Sometimes, it just hangs forever.

This test is testing what happens when:

* You have two processes
* One is blocked opening a FIFO for reading (to redirect to a child process)
* The other one sends a signal to that process
* And then opens the FIFO for writing (which should unblock the child process)

When this test hangs forever, for me,

* The child process is blocked on opening the FIFO (i.e. it's waiting for a writer)
* But the parent process successfully wrote data to the FIFO already somehow (this shouldn't be possible - the parent should have been blocked opening the FIFO until the open succeeded in the child).

Actually I believe this is a bug in macOS. The following program will fail with `write (parent): Broken pipe` on macOS when run in a loop, but works correctly on Linux: https://gist.github.com/KJTsanaktsidis/fc84b006cfff1bb0b55a2571df825d80

I'm going to open a PR to skip this test on macos because I believe the operating system is broken here, and as far as I can tell Ruby is doing the correct thing.



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