compile with code::blocks c++17 mingw compiler

[ken-sf]

I had to modify the code slightly to compile using code::blocks with the mingw compiler.

#ifndef UNICODE//https://stackoverflow.com/questions/13977388/error-cannot-convert-const-wchar-t-13-to-lpcstr-aka-const-char-in-assi
#define UNICODE
#define UNICODE_WAS_UNDEFINED
#endif

#include <Windows.h>

#ifdef UNICODE_WAS_UNDEFINED
#undef UNICODE
#endif