glapi/glx: Remove g_disptab.h from xserver generated files

glapi/glx: Remove g_disptab.h from xserver generated files

That file was removed from the xserver with commit:

    commit a80780a7638f847c3be20e5e0c7fe85e83d9bdd1
    Author: Adam Jackson <ajax@redhat.com>
    Date:   Wed Nov 17 09:03:06 2010 -0500

        glx: Remove swap barrier and hyperpipe support

        Never implemented in any open source driver.  The implementation
        assumed explicit DDX driver knowledge of how the client-side driver
        worked, since at the time the server's GL renderer was not a DRI driver.
        But now, it is, so any implementation of these should be done with
        additional DRI driver API, like the swap control extension.

        Reviewed-by: Julien Cristau <jcristau@debian.org>
        Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
        Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>