config64.py generate compiler errors

The configuration produces compiler errors in the cpp binding. 

Enviroment: Ubuntu 18.04

Compiler: gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.

Steps to reproduce:

1. The user launches with python3 configure64.py
2.  At the screen list start selecting things, in the following way

Choose a Scheme to support - 0 to finish: 1                
Choose a Scheme to support - 0 to finish: 2
ecp_C25519.cpp: In function ‘int C25519::ECP_get(int64_t*, C25519::ECP*)’
ecp_C25519.cpp:260:14: error: cannot convert ‘C25519::ECP’ to ‘C25519::ECP*’ for argument ‘1’ to ‘void C25519::ECP_affine(C25519::ECP*)’
  ECP_Choose a Scheme to support - 0 to finish: 4Choose a Scheme to support - 0 to finish: 4
Choose a Scheme to support - 0 to finish: 5
Choose a Scheme to support - 0 to finish: 6
Choose a Scheme to support - 0 to finish: 7
Choose a Scheme to support - 0 to finish: 8
Choose a Scheme to support - 0 to finish: 9
Choose a Scheme to support - 0 to finish: 10
rom_field_NIST521.cpp:26:17: error: ‘B528_56’ is not a namespace-name
using namespace B528_56;
^~~~~~~
rom_field_NIST521.cpp:26:24: error: expected namespace-name before ‘;’ token
using namespace B528_56;
^
rom_field_NIST521.cpp:29:7: error: ‘BIG’ does not name a type
const BIG Modulus= {0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0x1FFFFFFFFFFL};
^~~
rom_field_NIST521.cpp:30:7: error: ‘BIG’ does not name a type
const BIG R2modp= {0x4000000000L,0x0L,0x0L,0x0L,0x0L,0x0L,0x0L,0x0L,0x0L};
Choose a Scheme to support - 0 to finish: 5
Choose a Scheme to support - 0 to finish: 6
Choose a Scheme to support - 0 to finish: 7
Choose a Scheme to support - 0 to finish: 8
Choose a Scheme to support - 0 to finish: 9
Choose a Scheme to support - 0 to finish: 10
rom_field_NIST521.cpp:26:17: error: ‘B528_56’ is not a namespace-name
using namespace B528_56;
^~~~~~~
rom_field_NIST521.cpp:26:24: error: expected namespace-name before ‘;’ token
using namespace B528_56;
^
rom_field_NIST521.cpp:29:7: error: ‘BIG’ does not name a type
const BIG Modulus= {0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0xFFFFFFFFFFFFFFFL,0x1FFFFFFFFFFL};
^~~
rom_field_NIST521.cpp:30:7: error: ‘BIG’ does not name a type
const BIG R2modp= {0x4000000000L,0x0L,0x0L,0x0L,0x0L,0x0L,0x0L,0x0L,0x0L};affine(W);

Suppose now select 0 and exit, we will follow instructions as readme.rst and we have.

g++ -O2 testall.cpp amcl.a -o testall.exe
testall.cpp:27:10: fatal error: mpin_BN254.h: No such file or directory
#include "mpin_BN254.h"