Core: Fix non-PCH building

src/server/scripts/Spells/spell_paladin.cpp

@@ -21,8 +21,9 @@
  * Scriptnames of files in this file should be prefixed with "spell_pal_".
  */
 
+#include "ScriptMgr.h"
+#include "SpellScript.h"
 #include "SpellAuraEffects.h"
-#include "Unit.h"
 
 
 enum PaladinSpells