[PATCH v2 1/4] feature: realize libzstd check, LIBZSTD_DIR and NO_LIBZSTD defines

Implement libzstd feature check, NO_LIBZSTD and LIBZSTD_DIR defines to override Zstd library sources or disable the feature from the command line: $ make -C tools/perf LIBZSTD_DIR=/root/abudanko/zstd-1.3.7 clean all $ make -C tools/perf NO_LIBZSTD=1 clean all Signed-off-by: Alexey Budankov

[PATCH v2 1/4] feature: realize libzstd check, LIBZSTD_DIR and NO_LIBZSTD defines

Implement libzstd feature check, NO_LIBZSTD and LIBZSTD_DIR defines to overrride Zstd library sources or disable the feature from the command line: $ make -C tools/perf LIBZSTD_DIR=/root/abudanko/zstd-1.3.7 clean all $ make -C tools/perf NO_LIBZSTD=1 clean all Signed-off-by: Alexey Budankov