video/video-info: Don't use bool return of gst_video_info_set_format()/align()...
video/video-info: Don't use bool return of gst_video_info_set_format()/align() when running with GStreamer < 1.11.1
The bool return value was added in 1.11.1 and using the return value with older versions gives a random value that might be true or false, and then causes spurious errors.
Fixes #236 (comment 399872)