McClellan refactor

Taking dfa strat out of McClellan, to be reused by other DFAs

src/nfa/mcclellancompile_util.h

@@ -55,8 +55,6 @@ size_t hash_dfa_no_reports(const raw_dfa &rdfa);
 /** \brief Compute a simple hash of this raw_dfa, including its reports. */
 size_t hash_dfa(const raw_dfa &rdfa);
 
-dstate_id_t get_sds_or_proxy(const raw_dfa &raw);
-
 bool can_die_early(const raw_dfa &raw, u32 age_limit);
 
 } // namespace ue2