trace-cmd: make libtracecmd a little more library friendly

Whenever you link against libtracecmd you will get a bunch of debugging output
if you don't provide your own pr_stat().  So instead default to no output if we
don't provide a pr_stat().  Thanks,

Link: http://lkml.kernel.org/r/1448053053-24188-3-git-send-email-jbacik@fb.com

Signed-off-by: Josef Bacik <jbacik@fb.com>
[ Added missed updates for make gui ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
20 files changed