Log Message:
Update x11vnc to 0.9.7.

Pkgsrc changes:
 * add avahi option (disabled by default).

Notes:

New in the 0.9.7 x11vnc release:

        Basic support for building with VirtualGL's TurboVNC (an
                enhanced TightVNC for fast LAN high framerate usage)
                encoding and TightVNC modifications.  More info:
                http://www.karlrunge.com/x11vnc/faq.html#faq-turbovnc
                and x11vnc/misc/turbovnc/README.

        The -ncache_cr option has been fixed and so in -ncache mode
                smooth opaque window motions are now work correctly. Try
                it out to see how smooth it is even on a slow link.

        Support for Linux text consoles (virtual terminals, e.g. 1-6)
                is provided via, e.g., 'x11vnc -rawfb vt2' (for virtual
                terminal #2).

                This is like LinuxVNC (i.e. text only), it avoids using
                /dev/fb and uses /dev/vcsaN instead (the '-rawfb console'
                mode uses /dev/fb.)  With /dev/vcsaN the text terminal
                is accessible even it if is not the currently active one.

        The -rawfb option now supports framebuffers with bits per pixel
                less than 8 (e.g. 4 or 1 bpp.)

        Reverse connections now work in Anonymous Diffie Hellman SSL/TLS
                mode.  Reverse connections also work for VeNCrypt and
                ANONTLS modes.

  miscellaneous new features and changes:

        The included SSL enabled UltraVNC java viewer now has a
                configurable [Home] entry in the drives drop down menu.

        In the -create, -svc, etc. modes one can now specify a
                range of X displays to ignore in X11VNC_SKIP_DISPLAY.
                Improvements and bugfixes were made to the find_display
                and create_display scripts.  FD_EXTRA option is provided.

        The '-rawfb video' option finds the video device file more
                carefully.

        The -rmflag option allows a new way to indicate to other
                applications that x11vnc has started.

        All of the java applet parameters are now documented in
                the classes/ssl/README file.

        There is now a "sendbell" remote control command.

        A one-time -padgeom once:WxH mode is added.

        Improvements to the CUPS Terminal Services helper mode.

        If the X display cannot be opened normally then the env. var.
                XAUTHLOCALHOSTNAME=localhost is tried.

        Bugfix for selection transfer to a now non-existent X window
                (Thunderbird can cause this.)  Related, the env. variable
                LIBXCB_ALLOW_SLOPPY_LOCK is now set by default.

        Bugfix for -8to24 mode due to nonstandard indexed color support.

        The libvncserver and x11vnc autoconf/automake settings have
                been improved.

        libXrandr include file is now found on Solaris.