perf build: Add NO_SYSCALL_TABLE=1 to the build tests

So that we make sure that even on x86-64 and other architectures where
that is the default method we test build the fallback to libaudit that
other architectures use.

I.e. now this line got added to:

  $ make -C tools/perf build-test
  <SNIP>
       make_no_syscall_tbl_O: cd . && make NO_SYSCALL_TABLE=1 FEATURES_DUMP=/home/acme/git/perf/tools/perf/BUILD_TEST_FEATURE_DUMP -j12 O=/tmp/tmp.W0HtKR1mfr DESTDIR=/tmp/tmp.lNezgCVPzW
  <SNIP>
  $

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>