Remove unused import

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/PythonContext.java

@@ -188,7 +188,6 @@
 import com.oracle.truffle.api.TruffleLanguage.Env;
 import com.oracle.truffle.api.TruffleLogger;
 import com.oracle.truffle.api.TruffleSafepoint;
-import com.oracle.truffle.api.TruffleThreadBuilder;
 import com.oracle.truffle.api.dsl.Bind;
 import com.oracle.truffle.api.dsl.GenerateInline;
 import com.oracle.truffle.api.dsl.GenerateUncached;