changed numeric char type defs from char to signed char

components/esm/defs.hpp

@@ -68,7 +68,7 @@ struct ENAMstruct
 
   // Which skills/attributes are affected (for restore/drain spells
   // etc.)
-  char skill, attribute; // -1 if N/A
+  signed char skill, attribute; // -1 if N/A
 
   // Other spell parameters
   int range; // 0 - self, 1 - touch, 2 - target (RangeType enum)