Log Message:
Update ezmlm-idx to 0.421. From the changelog:

ezmlm-idx-0.421, 20040602
=========================
-Updated ezmlmrc.fr.  Thanks Jean-Marc Lasgouttes.
-Fixed bug in ezmlm-request when dealing with continuation lines.
 Thanks Sami Farin.
-Replaced many library with public-domain sources.
-Fixed "log" function conflicting with built-in math function.
-Fixed problem with "test -e" in makelang.sh for Solaris.
-Fixed typo bug in ezmlm-cron.
-Fixed uses of "head -#" and "tail -#" to "head -n \ 
#" and "tail -n #".

ezmlm-idx-0.42, 20040114 (New maintainer: Bruce Guenter <bruceg@em.ca>)
=======================================================================
-The ezmlmrc.* files were broken into two parts, to make them easier to
 write and maintain.  The language specific parts are stored in the
 "lang" subdirectory.
-Updated ezmlm-cgi to version 1.18, which includes the no banner
 security fix.
-Added ezmlmrc.hu.  Thanks Julian Severn-nek http://js.hu/
-Added ezmlmrc.nl.  Thanks Willem
-Fixed problem in ezmlm-send munging MIME attachments using implicit
 content types.  Thanks Ed
-Fixed typo in ezmlm-unsub -- manual unsubscriptions would be
 erroneously logged as "+manual"
-Fixed ezmlm-gate to handle the -Q option.  Thanks Bjoern Hansen.
-Fixed internal bug calling decodeHDR.
-Fix ezmlm-manage to properly send subscription confirmation to
moderators.  Thanks Mate Wierdl.
-Portability and bug fixes to ezmlm-test.
-Added a "dry-run" option to ezmlm-gate.
-Fixed ezmlm-send to fully handle QMQP relaying.  Thanks Bernhard Graf.
-Fixed ezmlm-gate to use "/bin/sh" consistently.  Thanks Bernhard Graf.
-Fixed ezmlm-cgi's output of non-standard port numbers.
-Fixed message archiving in subscribe-only moderated lists.

pkgsrc changes:

Set RESTRICTED directly in this package, rather than in
../ezmlm/Makefile.common, and clarify: in addition to the reasons
we cannot redistribute binary packages of ezmlm, ezmlm-idx is a
modification of the ezmlm source.

Set USE_BUILDLINK3=yes.

Introduce EZMLM_IDX_USE_{MY,PG}SQL. Each builds and runs, but I
haven't tested the database functions.