perf symbols: Kill struct build_id_list and die() another day

No need for this struct and its allocations, we can just use the
->build_id member we already have in struct dso, then ask for it
to be read, and later traverse the dsos list, writing the
buildid table to the perf.data file.

As a bonus, one more die() function got killed.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1258582853-8579-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/util/event.h

@@ -69,13 +69,6 @@ struct build_id_event {
 	char			 filename[];
 };
 
-struct build_id_list {
-	struct build_id_event	event;
-	struct list_head	list;
-	const char		*dso_name;
-	int			len;
-};
-
 typedef union event_union {
 	struct perf_event_header	header;
 	struct ip_event			ip;