st/dri: Add shared usage on buffers created

Tested-by: Scott Moreau <oreaus@gmail.com>
Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>

src/gallium/state_trackers/dri/drm/dri2.c

@@ -314,6 +314,9 @@ dri2_allocate_buffer(__DRIscreen *sPriv,
          break;
    }
 
+   /* because we get the handle and stride */
+   bind |= PIPE_BIND_SHARED;
+
    switch (format) {
       case 32:
          pf = PIPE_FORMAT_B8G8R8A8_UNORM;