fix style

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/truffle/PythonArithmeticTypes.java

@@ -33,7 +33,6 @@
 import com.oracle.truffle.api.dsl.TypeCast;
 import com.oracle.truffle.api.dsl.TypeCheck;
 import com.oracle.truffle.api.dsl.TypeSystem;
-import com.oracle.truffle.api.strings.TruffleString;
 
 /**
  * This type system is supposed to be used in builtin nodes to reduce the number of specializations

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/truffle/PythonTypes.java

@@ -32,7 +32,6 @@
 import com.oracle.truffle.api.dsl.TypeCast;
 import com.oracle.truffle.api.dsl.TypeCheck;
 import com.oracle.truffle.api.dsl.TypeSystem;
-import com.oracle.truffle.api.strings.TruffleString;
 
 @TypeSystem
 public abstract class PythonTypes {