perf bpf: Move perf_event_output() from stdio.h to bpf.h

So that we don't always carry that __bpf_output__ map, leaving that to
the scripts wanting to use that facility.

'perf trace' will be changed to look if that map is present and only
setup the bpf-output events if so.

Cc: Adrian Hunter <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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