tools build: Fix removal of feature-sync-compare-and-swap feature detection

tools build: Fix removal of feature-sync-compare-and-swap feature detection

The patch removing the feature-sync-compare-and-swap feature detection
didn't remove the call to main_test_sync_compare_and_swap(), making the
'test-all' case fail an all the feature tests to be performed
individually:

  $ cat /tmp/build/perf/feature/test-all.make.output
  In file included from test-all.c:18:
  test-libpython-version.c:5:10: error: #error
      5 |         #error
        |          ^~~~~
  test-all.c: In function ‘main’:
  test-all.c:203:9: error: implicit declaration of function ‘main_test_sync_compare_and_swap’ [-Werror=implicit-function-declaration]
    203 |         main_test_sync_compare_and_swap(argc, argv);
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  cc1: all warnings being treated as errors
  $

Fix it, now to figure out what is that test-libpython-version.c
problem...

Fixes: 60fa754b2a5a4e0c ("tools: Remove feature-sync-compare-and-swap feature detection")
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/YZU9Fe0sgkHSXeC2@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>