win32: silence build warning

glocalfileinfo.c: In function '_g_local_file_info_get':
glocalfileinfo.c:1955:11: warning: passing argument 3 of
'get_thumbnail_attributes' from incompatible pointer type [enabled by
default]
           get_thumbnail_attributes (path, info, &statbuf);
           ^
glocalfileinfo.c:1285:1: note: expected 'const struct GStatBuf *' but
argument is of type 'struct _stati64 *'
 get_thumbnail_attributes (const char     *path,

https://bugzilla.gnome.org/show_bug.cgi?id=711547

gio/thumbnail-verify.h

@@ -23,9 +23,10 @@
 
 #include <glib.h>
 #include <gstdio.h>
+#include "glocalfileinfo.h"
 
 gboolean   thumbnail_verify                   (const gchar            *thumbnail_path,
                                                const gchar            *file_uri,
-                                               const GStatBuf         *file_stat_buf);
+                                               const GLocalFileStat   *file_stat_buf);
 
 #endif /* _thumbnail_verify_h_ */