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make the userspace-rcu dependency optional

Maxim Onciul requested to merge make_liburcu_optional into master

Disable the userpace-rcu support by default. Our used userspace-rcu flavor memb is rather new and not available in liburcu version 0.10 available in debian buster. This change switches from using DCE and "if constexpr" to the C preprocessor so the library is only needed when the userspace-rcu support is actually enabled.

Motivation is building the emper on our bigboxes.

Edited by Maxim Onciul

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