ezmlm-idx QMQP support does not work

[Wayne Chu]

I installed ezmlm-0.53+ezmlm-idx-0.40.
Patched qmail-qmqpc as instructed in qmail-qmqpc.tar.gz
(I checked qmail-qmqpc.c,  it's patched.)
Put a "DIR/qmqpservers" file in my list directory. 

But ezmlm-send still uses qmail-queue instead of qmail-qmqpc 
to deliver posts.  The QMQP support in ezmlm-idx-0.40 does not
seem to work at all.

What was wrong?