[Beignet] [PATCH] Fix build with latest libdrm

[Rebecca N. Palmer]

> +  if (drm_intel_get_pooled_eu(driver->fd) >= 0) {

Shouldn't this be >0 , not >=0? The libdrm commit message ( 
https://cgit.freedesktop.org/mesa/drm/commit/intel/intel_bufmgr_gem.c?id=98887140e343493f01be7a1dec721c024bcf72c7 
) says 0 means not supported.

(>=0 works for me with libdrm 2.4.71, but on a 3.16 kernel these 
functions are always going to fail...)