fix memory detection on FreeBSD
fix finding a 64bit architecture on FreeBSD
fixed finding a 64bit architecture on NetBSD/OpenBSD and FreeBSD
added Darwin as 64bit architecture, as kaalis pointed out in https://github.com/rackerhacker/MySQLTuner-perl/pull/27#issuecomment-15450764
added Darwin as 64bit architecture, as kaalis pointed out in https://github.com/rackerhacker/MySQLTuner-perl/pull/27#issuecomment-15450764
fixed uname execution syntax
Merge pull request #32 from gibas/add-darwin-arch

Add darwin arch