8287902: UnreadableRB case in MissingResourceCauseTest is not working reliably on Windows

Backport-of: 975316e3e5f1208e4e15eadc2493d25c15554647

Author: gdams

test/jdk/java/util/ResourceBundle/Control/MissingResourceCauseTest.java

@@ -34,7 +34,9 @@ public static void main(String[] args) {
         callGetBundle("PrivateConstructorRB", IllegalAccessException.class);
         callGetBundle("AbstractRB", InstantiationException.class);
         callGetBundle("BadStaticInitRB", ExceptionInInitializerError.class);
-        callGetBundle("UnreadableRB", IOException.class);
+        if (!System.getProperty("os.name").toLowerCase().startsWith("win")) {
+            callGetBundle("UnreadableRB", IOException.class);
+        }
     }
 
     private static void callGetBundle(String baseName,