CentOS 6 no longer includes ExtUtils::MakeMaker in the core Perl RPMs, so we have to specify it as a build dependency.
Since the site Perl folders are in very different locations on CentOS 6 compared to CentOS 5, switch to building lists of files instead of hard-coding their locations in the %files section.
Moves Qpsmtpd::ConfigServer man page to async RPM.
Merge pull request #52 from rsiddall/master

Changes to make Qpsmtpd RPM build under CentOS 6.x