fe937e21ad
This reverts commit 39a9cd94651d306117c47ea1ac3eab45f6098d0e. There is no need to explicitly take ownership in fixup_after_exec; if ownership transfer is needed, it will be taken care of by fhandler_fifo::close when the parent closes. Moreover, closing the parent's fifo_reader_thread can cause problems, such as the one reported here: https://cygwin.com/pipermail/cygwin-patches/2020q2/010235.html
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