mpi: Suppress newer gcc warnings.

[Werner Koch]

On Thu,  5 Sep 2013 09:16, jussi.kivilinna at iki.fi said:

> Or is just having __GNUC__ > 2 enough? GCC manuals for 3.0.4 and 2.95.3 show support for 'unused' attribute.

I am not sure about this.  It is easier to require a later version of
gcc than to test it with all that old versions.

Sure the code is buggy and we should also check whether I did the same c+p
error elsewhere.


Salam-Shalom,

   Werner

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