PR 1098: "struct ipovly" not packed.

[Chris Johns]

This PR:

http://www.rtems.com/cgi-bin/gnatsweb.pl?cmd=view&database=RTEMS&pr=1098

contains a patch related to this thread:

http://www.rtems.org/ml/rtems-users/2006/may/msg00060.html

It requires the packing of "struct ipovly" and "struct tcpiphdr".

I would like to commit this patch and close the PR but before I do this 
I would like to know why this patch is needed for a specific ARM board 
and network device and not others.

Regards
Chris