aio-posix: fix build failure io_uring 2.2

The io_uring fixed "Don't truncate addr fields to 32-bit on 32-bit":
https://git.kernel.dk/cgit/liburing/commit/?id=d84c29b19ed0b130000619cff40141bb1fc3615b

This leads to build failure:
../util/fdmon-io_uring.c: In function ‘add_poll_remove_sqe’:
../util/fdmon-io_uring.c:182:36: error: passing argument 2 of ‘io_uring_prep_poll_remove’ makes integer from pointer without a cast [-Werror=int-conversion]
  182 |     io_uring_prep_poll_remove(sqe, node);
      |                                    ^~~~
      |                                    |
      |                                    AioHandler *
In file included from /root/io/qemu/include/block/aio.h:18,
                 from ../util/aio-posix.h:20,
                 from ../util/fdmon-io_uring.c:49:
/usr/include/liburing.h:415:17: note: expected ‘__u64’ {aka ‘long long unsigned int’} but argument is of type ‘AioHandler *’
  415 |           __u64 user_data)
      |           ~~~~~~^~~~~~~~~
cc1: all warnings being treated as errors

Use LIBURING_HAVE_DATA64 to check whether the io_uring supports 64-bit
variants of the get/set userdata, to convert the paramter to the right
data type.

Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Message-Id: <20220221162401.45415-1-haiyue.wang@intel.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

util/fdmon-io_uring.c

@@ -179,7 +179,11 @@ static void add_poll_remove_sqe(AioContext *ctx, AioHandler *node)
 {
     struct io_uring_sqe *sqe = get_sqe(ctx);
 
+#ifdef LIBURING_HAVE_DATA64
+    io_uring_prep_poll_remove(sqe, (__u64)(uintptr_t)node);
+#else
     io_uring_prep_poll_remove(sqe, node);
+#endif
 }
 
 /* Add a timeout that self-cancels when another cqe becomes ready */