https://git.ruby-lang.org/ruby.git/commit/?id=feb8dc55b6

From feb8dc55b6d2acd8f87e0415af65ff861cc55828 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 19 May 2020 22:09:20 +0900
Subject: Include wchar.h before wrapping memchr

On mingw, wmemcpy() is defined as an inline function using
memcpy(), and the static inline wrapper causes a warning.

```
In file included from include/ruby/ruby.h:39,
                 from win32/file.c:5:
include/ruby/internal/memory.h:284:16: warning: 'ruby_nonempty_memcpy' is static but used in inline function 'wmemcpy' which is not static
  284 | #define memcpy ruby_nonempty_memcpy
      |                ^~~~~~~~~~~~~~~~~~~~
```

diff --git a/win32/file.c b/win32/file.c
index 133b5fb..a1b4098 100644
--- a/win32/file.c
+++ b/win32/file.c
@@ -2,12 +2,12 @@ https://github.com/ruby/ruby/blob/trunk/win32/file.c#L2
 /* before stdio.h in ruby/define.h */
 # define MINGW_HAS_SECURE_API 1
 #endif
+#include <wchar.h>
 #include "ruby/ruby.h"
 #include "ruby/encoding.h"
 #include "internal.h"
 #include "internal/error.h"
 #include <winbase.h>
-#include <wchar.h>
 #include <shlwapi.h>
 #include "win32/file.h"
 
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