Remove comments about breaking the specification.

Remove comments about breaking the specification.

I've discussed this issue with the Austin Group and it will be fixed in
future revisions of the specification. The issue was that ut_line fields
weren't supposed to be valid for LOGIN_PROCESS entries, while
getutxline() would try to match these records anyway.

They also agreed on our way of implementing pututxline() without
getutxid() (which other operating systems also do), but unfortunately
they disagreed with our way of replacing DEAD_PROCESS entries, which is
a pity. The current specification allows the utmpx database to become
infinitely big over time.

See also:	http://austingroupbugs.net/view.php?id=213#c378