Log Message:
Update rdesktop to 1.8.1

Note that major additions are CredSSP and smart card single-sign-on, but
I have no way of testing them, so rather than adding untested dependencies,
I disabled those options.

rdesktop (1.8.1)
  * Fix a typo in configure.ac
  * Fix a bug which made rdesktop steal CPU cycles.
  * Fix issue with reconnect, make use of deactivate variable
  * Added 4 new disconnect reasons with exit codes
  * Fix issues of window handling in SeamlessRDP parts of rdesktop
  * Fix a backward compability with OpenSSL < 0.9.9
  * Fix a bug when code needs a x window available but there are none.
  * Fix a sigsegv zeroing memory
  * Fix a 64bit portability issue

  -- Henrik Andersson <hean01@users.sourceforge.net> 2013-11-18

rdesktop (1.8.0)
  * Support for protocol negotiation eg. SSL/TLSv1 and CredSSP
  * Support for CredSSP + Kerberos authentication (NLA)
  * Support for smart card single-sign-on
  * Support passing smart card pin as password as argument
  * Added IPC for controlling a master rdesktop process
  * Support for connection sharing when using SeamlessRDP
  * Improved handling of network connection failures
  * Autoreconnect using the connection cookie at network failure
  * Fix a few smart card issues
  * Fix bug with mouse scroll handling
  * Fix for left/right braces in Italian keymap
  * Fix crash and memory leak in local drive redirection
  * Fixes issues with license files loading/saving

  -- Henrik Andersson <hean01@users.sourceforge.net> 2013-08-09