Included cpp file

[andr1972]

Is link GMP error because is #include "subset_product.cpp" , I changed to #include "subset_product.h"
and it is:

#pragma once
#include <list>
#include <gmpxx.h>
void randomize_I(gmp_randclass &rr, unsigned int seed);
void gen_I(mpz_class &n, mpz_class &b, int flag, mpz_class** &I, gmp_randclass &rr, unsigned int seed);

void arrcpy(mpz_class* &dest, mpz_class* &source, mpz_class &size);
int product_attack_1(mpz_class* &P,mpz_class &sizeP, mpz_class &Lambda, mpz_class &c, mpz_class** &I,int local_hamming_weight,mpz_class &sizeI, std::list<int*> &sol1, std::list<int*> &sol2, mpz_class &count, int frag, double total_time, char Q_bytes);