Issue #6056: Make multiprocessing use setblocking(True) on the sockets it uses.

Original patch by J Derek Wilson.
diff --git a/Misc/ACKS b/Misc/ACKS
index 51b5996..e04677e 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1021,6 +1021,7 @@
 Gerald S. Williams
 Frank Willison
 Greg V. Wilson
+J Derek Wilson
 Jody Winston
 Collin Winter
 Dik Winter