Patch #1309579: wait3 and wait4 were added to the posix module by Chad J. Schroeder.

This was a fair amount of rework of the patch.  Refactored test_fork1 so it
could be reused by the new tests for wait3/4.  Also made them into new style
unittests (derive from unittest.TestCase).
diff --git a/Misc/NEWS b/Misc/NEWS
index 8069142..06f64f6 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -295,6 +295,8 @@
 Extension Modules
 -----------------
 
+- Patch #1309579: wait3 and wait4 were added to the posix module.
+
 - Patch #1231053: The audioop module now supports encoding/decoding of alaw.
   In addition, the existing ulaw code was updated.