bug in __lin_interpn__.cc for decreasing coordinates

[Alexander Barth]

Hi all again,
this code,

[x,y,z] = ndgrid(0:2);
f = x.^2+y.^2+z.^2;
fi = interpn(x,y,-z,f,1.5,1.5,-1.5)

returns NA (octave 3.0.0) while the correct answer is 7.5. The attached
patch, handles the case for decreasing coordinate values in
__lin_interpn__.cc

Proposed changelog:
__lin_interpn__.cc: handle decreasing coordinate values

Thanks,
Alex
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