Log Message:
- Do a PERL_REPLACE on cgi/configure.pl.in not configure.pl.in
- dspam.conf can contain sensitive information such as SQL
  username/password accounts.  So change ownership to root:dspam and mode to
  0640.
- The cgi template cgi/templates/nav_performance.html contains a
  @yourdomain.com which should be customised on install.
  Added an extra BUILD_DEFS called DSPAM_DOMAIN to allow users to do this.

ok'ed xtraeme@