slirp updates

Andrew Oates (1):
  slirp: fix ICMP handling on macOS hosts

Gavin Grant (1):
  slirp: Propagate host TCP RST packet to the guest after socket
    disconnected

Peter Maydell (1):
  slirp: document mbuf pointers and sizes

# gpg: Signature made Sun 07 Oct 2018 19:04:13 BST
# gpg:                using RSA key E3F65A9E9560DB4C
# gpg: Good signature from "Samuel Thibault <samuel.thibault@aquilenet.fr>"
# gpg:                 aka "Samuel Thibault <sthibault@debian.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@gnu.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@inria.fr>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@labri.fr>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@ens-lyon.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@u-bordeaux.fr>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 900C B024 B679 31D4 0F82  304B D017 8C76 7D06 9EE6
#      Subkey fingerprint: 33FA 7B64 6195 01F8 CE9C  8F97 E3F6 5A9E 9560 DB4C

* remotes/thibault/tags/samuel-thibault:
  slirp: Propagate host TCP RST packet to the guest after socket disconnected
  slirp: fix ICMP handling on macOS hosts
  slirp: document mbuf pointers and sizes

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>