libtraceevent: Increase libtraceevent logging when verbose

libtraceevent has added more levels of debug printout and with changes
like:

  https://lore.kernel.org/linux-trace-devel/20210507095022.1079364-3-tz.stoyanov@gmail.com

previously generated output like "registering plugin" is no longer
displayed.

This change makes it so that if perf's verbose debug output is enabled
then the debug and info libtraceevent messages can be displayed.

The code is conditionally enabled based on the libtraceevent version as
discussed in the RFC:

  https://lore.kernel.org/lkml/20210610060643.595673-1-irogers@google.com/



v2. Is a rebase and handles the case of building without
    LIBTRACEEVENT_DYNAMIC.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/lkml/20210923001024.550263-4-irogers@google.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>