Comment 16 for bug 7454

I've attached the fix, tested on ppc, debian m68k, alpha and i686. Turns
out that the group descriptor byte swapping code was not being run on the
last group due to miscalculation of the number of groups.

The patch includes an improved make check fix. Please disregard the
previous patch I sent for make check. Make check should now pass in a BSD
user land (works on Mac OS X).

Thanks to Wouter Verhelst for providing a big-endian box for testing.

-F