perf build: Minor improvement for linking libzstd

The zstd library will be automatically linked by detecting the feature
libzstd.  It is no need to explicitly link it for static builds, so
remove the redundant linkage.

It is contradictory to detect the feature libelf-zstd while the build
configuration NO_LIBZSTD is set.  Report an error for reminding users
not to set NO_LIBZSTD.

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: Quentin Monnet <[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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