[openssl/openssl] 7f4c65: Fix undefined ipi_spec_dst for cygwin build.

[Tristan Lelong]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 7f4c65749f7e9e687d5aa38e9b3fb548705511b9
      https://github.com/openssl/openssl/commit/7f4c65749f7e9e687d5aa38e9b3fb548705511b9
  Author: Tristan Lelong <tlelong at google.com>
  Date:   2022-09-08 (Thu, 08 Sep 2022)

  Changed paths:
    M crypto/bio/bss_dgram.c

  Log Message:
  -----------
  Fix undefined ipi_spec_dst for cygwin build.

The 'struct in_pktinfo' doesn't have a 'ipi_spec_dst' field on windows
OS which break cygwin builds of OpenSSL.

Signed-off-by: Tristan Lelong <tlelong at google.com>

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19134)