bpftool: Complete libbfd feature detection

Commit 6e8ccb4f ("tools/bpf: properly account for libbfd variations")
sets the linking flags depending on which flavor of the libbfd feature was
detected.

However, the flavors except libbfd cannot be detected, as they are not in
the feature list.

Complete the list of features to detect by adding libbfd-liberty and
libbfd-liberty-z.

Committer notes:

Adjust conflict with with:

  1e1613f6 ("tools bpftool: Don't display disassembler-four-args feature test")
  600b7b26 ("tools bpftool: Fix compilation error with new binutils")

Fixes: 6e8ccb4f ("tools/bpf: properly account for libbfd variations")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andres Freund <andres@anarazel.de>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: llvm@lists.linux.dev
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Song Liu <song@kernel.org>
Cc: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220719170555.2576993-2-roberto.sassu@huawei.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/bpf/bpftool/Makefile

@@ -93,9 +93,11 @@ INSTALL ?= install
 RM ?= rm -f
 
 FEATURE_USER = .bpftool
-FEATURE_TESTS = libbfd disassembler-four-args disassembler-init-styled libcap \
+FEATURE_TESTS = libbfd libbfd-liberty libbfd-liberty-z \
+	disassembler-four-args disassembler-init-styled libcap \
 	clang-bpf-co-re
-FEATURE_DISPLAY = libbfd libcap clang-bpf-co-re
+FEATURE_DISPLAY = libbfd libbfd-liberty libbfd-liberty-z \
+	libcap clang-bpf-co-re
 
 check_feat := 1
 NON_CHECK_FEAT_TARGETS := clean uninstall doc doc-clean doc-install doc-uninstall