Print compiler warning/runtime warning and truncate too long tracepoint names

Print compiler warning/runtime warning and truncate too long tracepoint names

- also apply to loglevel names.
- -Wsystem-headers needs to be used to get gcc to show the
  warnings from system headers (which is the category in which the
  tracepoint event declaration headers falls into).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>