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 <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-azwys8irxqx9053vpajr0k5h@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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