bug#18740: xf86-video-openchrome fails to build on all platforms

[Andreas Enge]

The problem occurred between
2014-09-01:
   http://hydra.gnu.org/build/84728
and 2014-09-23:3.16.3.
   http://hydra.gnu.org/build/97172

In between we updated linux-libre twice (to 3.16.3 and 3.16.3),
and glibc to 2.20.

Andreas