perf inject: Fix build id injection

Build Ids won't be injected unless the build id feature flag is set.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1405332185-4050-11-git-send-email-adrian.hunter@intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-inject.c

@@ -389,6 +389,9 @@ static int __cmd_inject(struct perf_inject *inject)
 	ret = perf_session__process_events(session, &inject->tool);
 
 	if (!file_out->is_pipe) {
+		if (inject->build_ids)
+			perf_header__set_feat(&session->header,
+					      HEADER_BUILD_ID);
 		session->header.data_size = inject->bytes_written;
 		perf_session__write_header(session, session->evlist, file_out->fd, true);
 	}