fix unit test with old versions of boost

gcontini

2020-02-10 205c71575c272a685011c641a33d26cf66cf60a0

 src/library/pc_identifier/pc_identifier.hpp

@@ -8,7 +8,6 @@
#ifndef SRC_LIBRARY_PC_IDENTIFIER_PC_IDENTIFIER_HPP_
#define SRC_LIBRARY_PC_IDENTIFIER_PC_IDENTIFIER_HPP_

#include <bits/stdint-uintn.h>
#include <array>
#include <iostream>
#include <string>