perl/perl-Mail-SPF: Fixed buildng on Slackware 13.37.
perl/perl-Mail-SPF: Fixed buildng on Slackware 13.37.

  Use Build method #2 from template to fix building.

Signed-off-by: dsomero <dae8ac18105ddd758ba5f28feddefd6acb687160@slackbuilds.org>

panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds