r600g: start using drm minor version to enable things.

If the drm minor version is > 9 (i.e. whats in drm-next),
we enable s3tc + texture tiling by default now.

this changes R600_FORCE_TILING to R600_TILING which can
be set to false to disable tiling on working drm.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/src/gallium/winsys/r600/drm/r600_priv.h b/src/gallium/winsys/r600/drm/r600_priv.h
index 2d91cd9..41c5ee0 100644
--- a/src/gallium/winsys/r600/drm/r600_priv.h
+++ b/src/gallium/winsys/r600/drm/r600_priv.h
@@ -50,6 +50,8 @@
 	unsigned			*cfence;
 	struct r600_bo			*fence_bo;
 	unsigned			clock_crystal_freq;
+	unsigned			num_backends;
+	unsigned                        minor_version;
 };
 
 struct r600_reg {