bpftool: Link zstd lib required by libelf

When the feature libelf-zstd is detected, the zstd lib is required by
libelf.  Link the zstd lib in this case.

Reviewed-by: Quentin Monnet <[email protected]>
Signed-off-by: Leo Yan <[email protected]>
Tested-by: Namhyung Kim <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Eduard Zingerman <[email protected]>
Cc: Guilherme Amadio <[email protected]>
Cc: Hao Luo <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Fastabend <[email protected]>
Cc: KP Singh <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Stanislav Fomichev <[email protected]>
Cc: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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