Core/Spells: update the core to the changes from 1fb1988d46 . To make your custom code work with those changes simply lookup the value of Targets enum value from prev rev, and update the name in your code.

src/server/scripts/Spells/spell_dk.cpp

@@ -354,7 +354,7 @@ class spell_dk_death_pact : public SpellScriptLoader
 
             void Register()
             {
-                OnUnitTargetSelect += SpellUnitTargetFn(spell_dk_death_pact_SpellScript::FilterTargets, EFFECT_1, TARGET_UNIT_AREA_ALLY_DST);
+                OnUnitTargetSelect += SpellUnitTargetFn(spell_dk_death_pact_SpellScript::FilterTargets, EFFECT_1, TARGET_UNIT_DEST_AREA_ALLY);
             }
         };