perldelta for close(STDOUT) for a popen(STDOUT) on Win32

Author: tonycoz

pod/perldelta.pod

@@ -395,6 +395,11 @@ reading and that error is C<EAGAIN> or C<EWOULDBLOCK>.  This allows
 old code that depended on C<readline> to clear all errors to ignore
 these relatively harmless errors.  [GH #22883]
 
+=item *
+
+C<close(STDOUT)> when C<STDOUT> has been opened as a pipe will now
+properly wait for the child to exit on Windows.  [GH #4106]
+
 =back
 
 =head1 Known Problems