[Merge] lp:~nathwill/ubuntu/quantal/pam/lp110287 into lp:~ubuntu-core-dev/pam/ubuntu

[Nathan Williams]

ugh. fixed that. thanks for catching. went ahead and flipped the dpkg version comparison as recommended. left the empty string comparison, because i believe that accounts for the new-install scenario?
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https://code.launchpad.net/~nathwill/ubuntu/quantal/pam/lp110287/+merge/112911
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