perf version: Add a feature for libpfm4

If perf is built with libpfm4 (LIBPFM4=1) then advertise it in perf -vv.

Signed-off-by: Ian Rogers <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-version.c

···
 	STATUS(HAVE_LIBBPF_SUPPORT, bpf);
 	STATUS(HAVE_AIO_SUPPORT, aio);
 	STATUS(HAVE_ZSTD_SUPPORT, zstd);
+	STATUS(HAVE_LIBPFM, libpfm4);
 }
 
 int cmd_version(int argc, const char **argv)