Out of util.h, to reduce its scope, and since we have a namespaces.h
header, much better to have it there, where it is related to.
Cc: Adrian Hunter
Cc: Jiri Olsa
Cc: Namhyung Kim
Link: https://lkml.kernel.org/n/tip-zlu81bbtccuzygh7m8nmgybc@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo