tools build: Remove the libunwind feature tests from the ones detected when test...

tools build: Remove the libunwind feature tests from the ones detected when test-all.o builds

We have a tools/build/feature/test-all.c that has the most common set of
features that perf uses and are expected to have its development files
available when building perf.

When we made libwunwind opt-in we forgot to remove them from the list of
features that are assumed to be available when test-all.c builds, remove
them.

Before this patch:

  $ rm -rf /tmp/b ; mkdir /tmp/b ; make -C tools/perf O=/tmp/b feature-dump ; grep feature-libunwind-aarch64= /tmp/b/FEATURE-DUMP
  feature-libunwind-aarch64=1
  $

Even tho this not being test built and those header files being
available:

  $ head -5 tools/build/feature/test-libunwind-aarch64.c
  // SPDX-License-Identifier: GPL-2.0
  #include <libunwind-aarch64.h>
  #include <stdlib.h>

  extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
  $

After this patch:

  $ grep feature-libunwind- /tmp/b/FEATURE-DUMP
  $

Now an audit on what is being enabled when test-all.c builds will be
performed.

Fixes: 176c9d1e6a06f2fa ("tools features: Don't check for libunwind devel files by default")
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>