modernize to c++-17

Below needs to be modernized
````
yyan7@yyan7-5820-Tower:~/work/compiler/rexompiler/src$ grep -r std::binary_function .
yyan7@yyan7-5820-Tower:~/work/compiler/rexompiler/src$ grep -r std::unary_function .
yyan7@yyan7-5820-Tower:~/work/compiler/rexompiler/src$ grep -r std::iterator .
yyan7@yyan7-5820-Tower:~/work/compiler/rexompiler/src$ grep -r bind2nd .
````