fe937e21ad
This reverts commit 39a9cd9465.
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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