#209 Build failed on cygwin

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build failed on cygwin because it does not include Microsoft <crtdbg.h>
In il_alloc.c :
change
// Memory leak detection
#ifdef _WIN32
#ifdef _DEBUG
#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#ifndef _WIN32_WCE // Does not have this header.
#include <crtdbg.h>
#endif
#endif
#endif//_WIN32

to

// Memory leak detection
#ifdef _WIN32
#ifdef _DEBUG
#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#if !defined(_WIN32_WCE) && !defined(__CYGWIN__) // Does not have this header.
#include <crtdbg.h>
#endif
#endif
#endif//_WIN32

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