[libgfortran] FPE support for ppc-darwin

[FX Coudert]

Attached patch should add support for 
-ffpe-trap={zero,denormal,precision,underflow,overflow} on ppc-darwin. 
Unfortunately, I don't have access to such computer any more, so I'm 
looking for someone to test this patch. Once compiled, you can test it 
with, eg:

$ cat a.f
       real*8 x
       x = -1
       print *, sqrt(x)
       end
$ gfortran a.f && ./a.out
                      NaN
$ gfortran a.f -ffpe-trap=invalid && ./a.out
Floating point exception


Thanks!
FX
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