cannot compile with hdf5

[Petr Mikulik]

> > | I propose to put a test into configure. Once that somebody updates the API,
> > | he can easily change the test condition towards newer version.
> >
> > I think it would be best to avoid version tests in the configure
> > script.
> 
> I agree in general, but given that the version 1.8 becomes
> increasingly common and we need 1.6, maybe a building user should at
> least get an informative warning somewhere? Otherwise, we will
> probably see a number of complaints for failing builds.

I agree. The "make" breaks compiling so the first thing the users tries to 
do is to search for a newer version of hdf5 and recompile Octave again...

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