6843761: Update langtools tests to remove unncessary -source and -target options

Reviewed-by: jjg

langtools/test/tools/javac/assert/Position.java

@@ -3,17 +3,17 @@
  * @bug 4469737
  * @summary Verify the source position for assertions.
  * @author gafter
- *
- * @compile -source 1.4 Position.java
- * @run main Position
  */
 
+
 public class Position {
     static public void main(String[] args) {
         Position.class.getClassLoader().setClassAssertionStatus("U", true);
         new U().main();
     }
 }
+
+
 class U {
     void main() {
         try {