perf build: Add a LIBPFM4=1 build test entry

So that when one runs:

  $ make -C tools/perf build-test

We make sure that recent changes don't break that opt-in build.

Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Alexey Budankov <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Andrii Nakryiko <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Florian Fainelli <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Igor Lubashev <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Jiwei Sun <[email protected]>
Cc: John Garry <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Yonghong Song <[email protected]>
Cc: yuzhoujian <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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