`time_t's. there were some types (like in lastlog) that we believed
to always be time_t. this has proven wrong on Solaris 8 in 64-bit
mode, where they are stored as 32-bit quantities but time_t has gone
up to 64 bits
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@8067 ec53bebd-3082-4978-b11e-865c3cabbd6b