Log Message:
rdesktop: update to 1.9.0.

Provided by Matthias Petermann in PR 54857.

Additionally, remove ssl option per 1.9.0 changelog.

rdesktop (1.9.0)
  * Use GnuTLS and nettle instead of OpenSSL
  * Improved certificate handling
  * Add support for dynamic resize of sessions
  * Add support for alpha cursors
  * Add PulseAudio support
  * Add Kerberos support on macOS
  * Kerberos support no longer requires libgssglue
  * Remove support for rdesktop's custom microphone extension
  * Several fixes to improve compatibility with modern desktops
  * macOS compatibility fixes
  * Improved handling of redirections
  * Many smart card bug fixes
  * Many disk redirection bug fixes
  * Improved logging
  * Lots of other small bug fixes

  -- Pierre Ossman <ossman@cendio.se> 2019-09-18

rdesktop (1.8.6)
  * Fix protocol code handling new licenses

  -- Pierre Ossman <ossman@cendio.se> 2019-05-16

rdesktop (1.8.5)
  * Add bounds checking to protocol handling in order to fix many
    security problems when communicating with a malicious server.

  -- Pierre Ossman <ossman@cendio.se> 2019-05-08