Derived from

  commit 978f3b496b9951ee8120a0efcc5cd12503e26770
  Author: Roland Mainz <roland.mainz@nrubsig.org>
  Date:   Sat Mar 5 21:38:29 2005 +0000

    xc/programs/Xserver/Imakefile
    xc/programs/Xserver/hw/xnest/Imakefile
    //bugs.freedesktop.org/show_bug.cgi?id=2653) attachment #2020
        (https://bugs.freedesktop.org/attachment.cgi?id=2020): Cleanup Xnest
        usage of the DPMS dummy stub functions from dpmsstubs.c instead of
        using it's own copy of these functions.

Fixes ArcticaProject/nx-libs#901