Issue #23400: Raise same exception on both Python 2 and 3 if sem_open is not available.

Patch by Davin Potts.

diff --cc Doc/library/multiprocessing.rst
Simple merge

diff --cc Lib/multiprocessing/queues.py
Simple merge

diff --cc Misc/NEWS
index 6c7c26364f9406471d6132b41f68070fb1c8dfe9,61162df258534976ce7d893ddf5aa08bb88b090e..7756bcef552cb39d095208f6a088a117f01cba97
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -19,14 -24,6 +19,17 @@@ Core and Builtin
  Library
  -------
  
++- Issue #23400: Raise same exception on both Python 2 and 3 if sem_open is not
++  available.  Patch by Davin Potts.
++
 +- Issue #10838: The subprocess now module includes SubprocessError and
 +  TimeoutError in its list of exported names for the users wild enough
 +  to use "from subprocess import *".
 +
 +- Issue #23411: Added DefragResult, ParseResult, SplitResult, DefragResultBytes,
 +  ParseResultBytes, and SplitResultBytes to urllib.parse.__all__.
 +  Patch by Martin Panter.
 +
  - Issue #23881: urllib.request.ftpwrapper constructor now closes the socket if
    the FTP connection failed to fix a ResourceWarning.