[Svn] [roundcube/roundcubemail] 83bd85: Remove x_frame_options env

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/roundcube/roundcubemail
  Commit: 83bd85677b297a8216706aeef03ef65fe3ccccaa
      https://github.com/roundcube/roundcubemail/commit/83bd85677b297a8216706aeef03ef65fe3ccccaa
  Author: Aleksander Machniak <alec at alec.pl>
  Date:   2018-01-07 (Sun, 07 Jan 2018)

  Changed paths:
    M program/include/rcmail_output_html.php

  Log Message:
  -----------
  Remove x_frame_options env