Misc: Fix warnings and build

Closes #10396

src/server/scripts/Spells/spell_priest.cpp

@@ -215,7 +215,7 @@ class spell_pri_item_greater_heal_refund : public SpellScriptLoader
                 return true;
             }
 
-            void HandleProc(AuraEffect const* aurEff, ProcEventInfo& eventInfo)
+            void HandleProc(AuraEffect const* aurEff, ProcEventInfo& /*eventInfo*/)
             {
                 PreventDefaultAction();
                 GetTarget()->CastSpell(GetTarget(), SPELL_PRIEST_ITEM_EFFICIENCY, true, NULL, aurEff);