Re: mxIs* functions now return bool

[John W. Eaton]

I see that you added stdbool to the list of gnulib modules in the 
changeset that you checked in.

That's OK, but it won't be seen by any Octave code since we no longer 
include any gnulib headers directly in the Octave sources because of the 
way they can conflict with C++.

I think it's safe to assume that stdbool.h just has to exist.  If it 
doesn't, then it's up to the user of mex.h to find a way to provide it.

jwe