INN users beware of ino_t change FreeBSD 11 to 12

[Christian Weisgerber]

User of INN (news/inn) should be aware of an issue when upgrading
from FreeBSD 11 to 12 with an existing news spool.

If the overview database is in the tradindexed format, which is the
default, the group.index file consists of records with an ino_t
member.  FreeBSD 12 has changed the size of the ino_t type, causing
an incompatible change in the database format.

In my case, both innd and makehistory -O would hang on startup and
spin in a busy loop.

To fix this, first truncate the overview/group.index file to size
zero and only then regenerate the history and overview databases
with makehistory -O.

-- 
Christian "naddy" Weisgerber                          naddy at mips.inka.de