Small fix for Mingw64 compilation

src/misc/block.c

@@ -303,7 +303,7 @@ ssize_t pread (int fd, void *buf, size_t count, off_t offset)
     if (handle == INVALID_HANDLE_VALUE)
         return -1;
 
-    OVERLAPPED olap = { .Offset = offset, .OffsetHigh = (offset >> 32), };
+    OVERLAPPED olap; olap.Offset = offset; olap.OffsetHigh = (offset >> 32);
     DWORD written;
     /* This braindead API will override the file pointer even if we specify
      * an explicit read offset... So do not expect this to mix well with