VC6 error

* win32/win32.c (GetSystemWindowsDirectoryW): use
  GetWindowsDirectoryW for VC6.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55535 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/win32.c

@@ -505,6 +505,11 @@ rb_w32_special_folder(int type)
     return rb_w32_conv_from_wchar(path, rb_filesystem_encoding());
 }
 
+#if defined _MSC_VER && _MSC_VER <= 1200
+/* License: Ruby's */
+#define GetSystemWindowsDirectoryW GetWindowsDirectoryW
+#endif
+
 /* License: Ruby's */
 UINT
 rb_w32_system_tmpdir(WCHAR *path, UINT len)