Function gsl_sys::gsl_spmatrix_long_double_alloc_nzmax

pub unsafe extern "C" fn gsl_spmatrix_long_double_alloc_nzmax(
    n1: usize, 
    n2: usize, 
    nzmax: usize, 
    sptype: c_int
) -> *mut gsl_spmatrix_long_double