libcgroup: Use --undefined-version with lld on sysvinit

[kraj]

These functions are unconditionally added to libcgroup.map Fixes aarch64-yoe-linux-musl-ld.lld: error: version script assignment of 'CGROUP_3.0' to symbol 'cgroup_create_scope' failed: symbol not defined aarch64-yoe-linux-musl-ld.lld: error: version script assignment of 'CGROUP_3.0' to symbol 'cgroup_set_default_scope_opts' failed: symbol not defined aarch64-yoe-linux-musl-ld.lld: error: version script assignment of 'CGROUP_3.0' to symbol 'cgroup_create_scope2' failed: symbol not defined aarch64-yoe-linux-musl-ld.lld: error: version script assignment of 'CGROUP_3.0' to symbol 'cgroup_write_systemd_default_cgroup' failed: symbol not defined

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