Return correct value for ischar() predicate test on octave_java objects. * libinterp/octave-value/ov-java.h(is_string): Rename is_string() to is_java_string. Leave only prototype in .h file. * libinterp/octave-value/ov-java.cc(is_java_string): Move code for is_string from ov-java.h to is_java_string in ov-java.cc.

#include "mex.h"

void
mexFunction (int nlhs, mxArray *plhs[], int nrhs, 
             const mxArray *prhs[])
{
  mxArray *v = mxCreateDoubleMatrix (1, 1, mxREAL);
  double *data = mxGetPr (v);
  *data = 1.23456789;
  plhs[0] = v;
}