perf tools: Add V=2 option to help debug config issues

perf tools: Add V=2 option to help debug config issues

commit 7baed9af4bf0d7850045e36d19a43a2c76872b62 upstream.

Make standard error show up on console when V=2 is set.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20091122112726.GC13644@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
[bwh: Backport to 2.6.32]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>