I wanted to briefly summarize an irc conversation we had on #debian-devel for anyone reading this bug.
In general, we want to get rid of libpam0g as soon as possible, because you cannot have both libpam0g and libpam0t64 installed at the same time. Steve is working on a series of NMUs to make that possible on arches where the ABI has actually changed. On arches where the ABI is the same, libpam0t64 provides libpam0g, so we can get rid of libpam0g today. --Sam
