libmatio test for homebrew formula

test_libmatio.cc

#include <stdlib.h>
#include <matio.h>

size_t dims[2] = {5, 5};
double data[25] = {0.0, };
mat_t *mat;
matvar_t *matvar;

int main(int argc, char **argv) {

  if (!(mat = Mat_Open(argv[1], MAT_ACC_RDONLY)))
    abort();
  Mat_Close(mat);

  mat = Mat_CreateVer("test_writenan.mat", NULL, MAT_FT_DEFAULT);
  
  if (mat) {
    matvar = Mat_VarCreate("foo", MAT_C_DOUBLE, MAT_T_DOUBLE, 2,
                            dims, data, MAT_F_DONT_COPY_DATA);
    Mat_VarWrite(mat, matvar, MAT_COMPRESSION_NONE);
    Mat_VarFree(matvar);
    Mat_Close(mat);
  } else {
    abort();
  }

  mat = Mat_CreateVer("foo", NULL, MAT_FT_MAT73);
  return EXIT_SUCCESS;

}