Comment 1 for bug 1953201

FWIW I'm going to mark this bug 'low' instead of high, on the basis that Debian has shipped pam 1.4.0 in a stable release and there hasn't even been a single bug report about this issue, it was only caught because of a bug in the Ubuntu autopkgtest-cloud implementation that was writing entries to /etc/environment without a final newline.

Also assigning the bug to Simon who did the Debian merge (thanks!), so he can assess whether this is something we should prioritize fixing.