perf tests: Skip the llvm and bpf tests if HAVE_LIBBPF_SUPPORT isn't defined

If either NO_LIBBPF=1 is passed, explicitely disabling it or if libbpf
is not available due to some missing dependency, skip its tests, telling
the user the feature isn't available.

  # perf test
  <SNIP>
  40: LLVM search and compile                                         : Skip (not compiled in)
  41: Session topology                                                : Ok
  42: BPF filter                                                      : Skip (not compiled in)
  <SNIP>

Cc: Adrian Hunter <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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