suitesparse_ldl_sys
pub unsafe extern "C" fn ldl_symbolic( n: ldl_int, ap: *const ldl_int, ai: *const ldl_int, lp: *mut ldl_int, parent: *mut ldl_int, lnz: *mut ldl_int, flag: *mut ldl_int, p: *const ldl_int, pinv: *const ldl_int)