[64bit] Problem with emacs and shared memory under X11

[Ken Brown]

On 64bit Cygwin, if I try to run emacs under X11 while cygserver is 
running, emacs fails to connect to the X server.  The error message from 
the X server is

   BadShmSeg (invalid shared segment parameter) on protocol request 131

To reproduce:

1. Install the current version of emacs-X11 (24.3-4).

2. Start the (64bit) cygserver service.

3. Start the (64bit) X server, e.g., by typing "startxwin" in a Cygwin 
Terminal.

4. In the resulting xterm, try to start emacs:

   $ emacs-X11.exe -Q &

The result is that emacs displays the error message above and then aborts.

emacs-X11 works fine if the X server is started when cygserver is not 
running.

Ken