[dovecot/core] 694007: lib-master: Fix SSL_TXT_SSLV2 check in settings

[GitHub]

  Branch: refs/heads/master-2.2
  Home:   https://github.com/dovecot/core
  Commit: 694007aff12d107f991c17e289b0e39f981b6cf1
      https://github.com/dovecot/core/commit/694007aff12d107f991c17e289b0e39f981b6cf1
  Author: Martti Rannanjärvi <martti.rannanjarvi at dovecot.fi>
  Date:   2018-01-10 (Wed, 10 Jan 2018)

  Changed paths:
    M src/lib-master/master-service-ssl-settings.c

  Log Message:
  -----------
  lib-master: Fix SSL_TXT_SSLV2 check in settings

Include <openssl/ssl.h> in src/lib-master/master-service-ssl-settings.c
so SSL_TXT_SSLV2 is defined there when defined in the header.