Eliminate compiler warnings on Windows
This patch will eliminate following warning message.
```
../../../../ext/RMagick/rmmain.c:128:12: warning: implicit declaration of function '_aligned_msize'; did you mean '_aligned_free'? [-Wimplicit-function-declaration]
128 |     return _aligned_msize(ptr, CACHE_LINE_SIZE, 0);
|            ^~~~~~~~~~~~~~
|            _aligned_free
```
@@ -124,7 +124,7 @@ rm_aligned_malloc_size(void *ptr)
// Refered to https://github.com/ImageMagick/ImageMagick/blob/master/MagickCore/memory-private.h
#define MAGICKCORE_SIZEOF_VOID_P 8
#define CACHE_LINE_SIZE (8 * MAGICKCORE_SIZEOF_VOID_P)
-
+ size_t _aligned_msize(void *memblock, size_t alignment, size_t offset);
return _aligned_msize(ptr, CACHE_LINE_SIZE, 0);
#endif
}
