Expand if race/trait to allow for richer comparisons

(Adapted from Windows code)

osx/boe.party.h

@@ -56,6 +56,7 @@ void kill_pc(short which_pc,eMainStatus type);
 void set_pc_moves();
 void take_ap(short num);
 short trait_present(short which_trait);
+short race_present(eRace which_race);
 short wilderness_lore_present();
 void print_spell_cast(short spell_num,short which);
 void put_party_in_scen(std::string scen_name);