perf bpf_skel: Do not use typedef to avoid error on old clang
When building bpf_skel with clang-10, typedef causes confusions like: libbpf: map 'prev_readings': unexpected def kind var. Fix this by removing the typedef. Fixes: 7fac83aa ("perf stat: Introduce 'bperf' to share hardware PMCs with BPF") Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Song Liu <songliubraving@fb.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lore.kernel.org/lkml/BEF5C312-4331-4A60-AEC0-AD7617CB2BC4@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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