merge the ignorelist from a script generated part and manually maintained part
    
    On secondary arches it can be usef to maintain the list of packages that are
    built in 2 parts - one is script generated and based on values of ExclusiveArch
    and ExcludeArch tags in source rpms and the second is maintained manually that
    should be skipped for some reason (eg. not yet decided whether to fix them or
    add ExcludeArch/ExclusiveArch)