perf_event_open.2: 4.1 PERF_EVENT_IOC_SET_BPF support

perf_event_open.2: 4.1 PERF_EVENT_IOC_SET_BPF support

This manpage patch relates to the addition of the
PERF_EVENT_IOC_SET_BPF ioctl in the following commit:

	commit 2541517c32be2531e0da59dfd7efc1ce844644f5
	Author: Alexei Starovoitov <ast@plumgrid.com>

	tracing, perf: Implement BPF programs attached to kprobes

	Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
	Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
	Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
	Cc: Andrew Morton <akpm@linux-foundation.org>
	Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
	Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
	Cc: Daniel Borkmann <daniel@iogearbox.net>
	Cc: David S. Miller <davem@davemloft.net>
	Cc: Jiri Olsa <jolsa@redhat.com>
	Cc: Linus Torvalds <torvalds@linux-foundation.org>
	Cc: Namhyung Kim <namhyung@kernel.org>
	Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
	Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1427312966-8434-4-git-send-email-ast@plumgrid.com
	Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>