Add -Werror to build_warnings

[Ben Elliston]

> > These flags are only used when the user
> > explicitly passes --enable-build-warnings
> 
> Huh?  I seem to get them by default.

Oh, I misread the shell code in configure.in.  OK, it's on by default.
In that case, I withdraw my patch.  We're not ready yet.

Cheers, Ben

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