update to xterm-238. Closes PR pkg/40334 and fixes CVE-2008-2383.

Patch #238 - 2008/12/30
* update configure macro CF_XOPEN_SOURCE for AIX 6.x and Mint platforms.
* reset the screen wrapping-flag at the end of ClearRight to fix an occasional
  case where the last character of a scrolled and wrapped line would be cleared
  (patch by Joe Peterson).
* modify to use POSIX coding for comparing resource settings such as locale,
  to work with locales such as Turkish (report by M Vefa Bicakci).
* turn on configure paste64 feature by default (request by
  Jean-Philippe Bernardy). It is runtime enabled/disabled with allowWindowOps.
* turn on configure tcap-query feature by default, add resource allowTcapOps
  to make this runtime enabled/disabled.
* make OSC 3 (change X property, from patch #110) subject to allowWindowOps
  resource.
* make VT220 DSR responses inactive in VT100-mode.
* make DECUDK feature inactive in VT100-mode.
* respond to incorrectly formatted DECRQSS with a cancel.
* add allowFontOps resource to allow the fontsize-switching and font query/set
  control sequences to be enabled/disabled (prompted by Debian #510030).
* some code cleanup based on gcc 4.x -Wconversion warnings in button.c and
  charproc.c
* modify tcap-query feature to not return data for shifted cursor-keys when
  the keyboard type is set to vt220, since returning the same string for
  shifted/unshifted keys may confuse some applications (GenToo #212546).

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