Removed the iteration count check in the test_opt_rigid_rand_rot() system test.
This number is different on a PowerPC chip with Mac OS X, even if the parameter values are
identical. This was identified by Jack Howarth (howarth att bromo dot med dot uc dot edu) in the
post https://mail.gna.org/public/relax-users/2010-02/msg00025.html.
