Snippets for bird 3.3.2 from Alpine s390x

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-s390x/community/bird/bird-3.3.2-r0.log.

• ./lib/route.h:616:18: warning: '__atomic_fetch_add_8' writing 8 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=]
    616 |   ASSERT_DIE(0 < atomic_fetch_add_explicit(&ea_get_storage(r)->uc, 1, memory_order_acq_rel));
        |                  ^~~~~~~~~~~~~~~~~~~~~~~~~
  

• sysdep/unix/io.c:2266:3: warning: 'ssh_channel_select' is deprecated [-Wdeprecated-declarations]
   2266 |   if (ssh_channel_select(rchans, NULL, NULL, &timev) == SSH_EINTR)
        |   ^~