Now that builtin.h isn't included by any other header, we can check
where it is really needed, i.e. we can remove it and be sure that it
isn't being obtained indirectly.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-mn7jheex85iw9qo6tlv26hb2@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>