bpo-34521: Add NEWS entry for changes in GH-9613 (GH-9850)

* Add News entry for the change in multiprocessing.reduction.recvfds
made in GH-9613.

diff --git a/Misc/NEWS.d/next/Library/2018-10-13-19-15-23.bpo-34521.YPaiTK.rst b/Misc/NEWS.d/next/Library/2018-10-13-19-15-23.bpo-34521.YPaiTK.rst
new file mode 100644 (file)
index 0000000..4f4a7f7
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-10-13-19-15-23.bpo-34521.YPaiTK.rst
@@ -0,0 +1,3 @@
+Use :func:`socket.CMSG_SPACE` to calculate ancillary data size instead of
+:func:`socket.CMSG_LEN` in :func:`multiprocessing.reduction.recvfds` as
+:rfc:`3542` requires the use of the former for portable applications.