When overriding rules, ensure that the sources match

In places where a second rule definition might replace, append to, or
replace items from a base rule, ensure that the source of the second
rule definiton matches the first.

This already existed for defines, but for other changes. There was a
bug where a second definition might exist for a different source, but
the additional rule was used anyway.

This now returns the same error for these other changes e.g. "Rule has
been re-defined..." as define.

Signed-off-by: Mark Stemm <mark.stemm@gmail.com>

userspace/engine/rule_loader_collector.h

@@ -97,6 +97,9 @@ public:
 	virtual void selective_replace(configuration& cfg, rule_update_info& info);
 
 private:
+	template<typename ruleInfo>
+	rule_info* find_prev_rule(ruleInfo& info);
+
 	uint32_t m_cur_index;
 	indexed_vector<rule_info> m_rule_infos;
 	indexed_vector<macro_info> m_macro_infos;