delete unnecessary compare overload

alib2data/src/automaton/PDA/NPDTA.h

@@ -109,16 +109,4 @@ public:
 
 } /* namespace automaton */
 
-namespace std {
-
-template < >
-struct compare < automaton::NPDTA > {
-	int operator ()( const automaton::NPDTA & first, const automaton::NPDTA & second ) const {
-		return first.compare ( second );
-	}
-
-};
-
-} /* namespace std */
-
 #endif /* NPDTA_H_ */