Log Message:
Update x2vnc from 1.5.1 to 1.7.2, and fix for modular X11 build:

Changes since version 1.7.1

    * Fixed some bugs

Changes since version 1.6.1

    * Now re-connects automatically
    * New input capture method which handles odd screen sizes better
    * Added -tunnel and -via for automatic SSH tunneling
    * Further fixes for cut'n'paste. (Should now work with java
      and on 64 bit platforms.)
    * Randr support allow x2vnc to detect when the screen is rotated

Changes since version 1.6

    * Added Martin Dorey's patch which fixes cut'n'paste for Java
      (and other) applications.
    * Fixed a bug in -navhack

Changes since version 1.5.1

    * Added some patches from Grant McDorman to allow proper
      cut'n'paste between x2vnc and Konsole/gnome-terminal.
    * Honor $DESTDIR to make packaging easier.
    * Added a workaround to make cut'n'paste work better with old
      VNC servers.
    * Since all new VNC servers already support wheel emulation
      themseleves, x2vnc doesn't translate wheel events to arrow
      up/down anymore unless -wheelhack is specified.
    * Added -navhack which is similar to -wheelhack, except it
      translates button 6 & 7 to Alt+Left/Right.
    * Added -debug to debug key events
    * Allow -edgewidth 0 to turn off edge-flipping