Fix comparaison between x86_32 and x86_64.

The fix proposed by http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323
is not working when recompiling jrl-walkgen and jrl-dynamic
with -msse and -mfpmath=sse.

However the two other algorithms do not suffer from the transition
between x86_32 and x86_64. Thus it might still come from a x87 problem
(aka an intermediate high resolution representation in CPU which is
lost after memory transfer) specific to Morisawa.

The trajectories are however very similar between each other. Thus
this differenciation is to maintain a working unitary test.