Log Message:
Update net/rdesktop to 1.8.3.

This makes rdesktop work with Windows Server 2012 and 2012 R2.

rdesktop (1.8.3)
  * Added a persistent mode used with SeamlessRDP
  * Added US international keyboard layout with dead keys
  * Code cleanup to match specifications, use constants defined
    instead of magic numbers, remove of dead code
  * Fix regression with failed connection and a invalid licensing
    message, introduced in 1.8.2
  * Fix issue with Non ASCII user / password when using CredSSP
  * Fix issues using smartcard redirection with Windows 2012 R2
  * Fix issue with windows key functionality
  * Fix memory corruption when using rdp_out_unistr()
  * Fix workaround for the lack of support for alpha cursors
  * Fix silent exit when redirected when using CredSSP
  * Fix crash when starting rdesktop without domain specified
    while using CredSSP
  * Fix issue in SeamlessRDP protocol parser upon reconnect
  * Fix issue were a new SeamlessRDP application is respawned
    upon a reconnection

  -- Henrik Andersson <hean01@users.sourceforge.net> 2014-10-31

rdesktop (1.8.2)
  * Support enhanced server redirection (Session broker 2012)
  * Support License Error Alert PDU
  * Changed default driver for printer redirection
  * Fix CredSSP login using non-ASCII username/password
  * Fix double login prompt bug with Win2008 server redirection
  * Fix keysym collisions
  * Fix mouse cursor with 2012 R2
  * Fix local drive redirection with Win8 / Win2012
  * Fix issue with mouse cursor hotspot
  * Fix issue with mouse / keyboard against VirtualBox RDP
  * Fix uncomplete czech keymap
  * Fix error in dutch keymap

  -- Henrik Andersson <hean01@users.sourceforge.net> 2014-05-20