Polyhedron tests on Intel Darwin8/9

[Dominique Dhumieres]

> Try -ffast-math.

Janne you are right with -O3 -ffast-math the loop reduces to:

L2:
        addi r9,r9,1
        bdnz L2

not fully removed, but close enough.  Now I'll have to
go back to induct.f90 to see where the time is spent and
check if the optimization is done or not.

Dominique