Use a different method to determine if we are on Java 11

This should be more likely to work on Android.

src/org/mozilla/javascript/JavaMembers.java

@@ -23,7 +23,6 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import javax.lang.model.SourceVersion;
 
 /**
  * @author Mike Shaver
@@ -33,8 +32,7 @@
  */
 class JavaMembers {
 
-    private static final boolean STRICT_REFLECTIVE_ACCESS =
-            SourceVersion.latestSupported().ordinal() > 8;
+    private static final boolean STRICT_REFLECTIVE_ACCESS = isModularJava();
 
     private static final Permission allPermission = new AllPermission();
 
@@ -59,6 +57,19 @@ class JavaMembers {
         }
     }
 
+    /**
+     * This method returns true if we are on a "modular" version of Java (Java 11 or up). It does
+     * not use the SourceVersion class because this is not present on Android.
+     */
+    private static boolean isModularJava() {
+        try {
+            Class.class.getMethod("getModule");
+            return true;
+        } catch (NoSuchMethodException e) {
+            return false;
+        }
+    }
+
     boolean has(String name, boolean isStatic) {
         Map<String, Object> ht = isStatic ? staticMembers : members;
         Object obj = ht.get(name);