fix test build

Author: GoeLin

test/lib/jdk/test/lib/process/OutputAnalyzer.java

@@ -224,6 +224,20 @@ public boolean stdoutContains(String expectedString) {
         return getStdout().contains(expectedString);
     }
 
+    /**
+     * Returns true if stderr contains the given string
+     */
+    public boolean stderrContains(String expectedString) {
+        return getStderr().contains(expectedString);
+    }
+
+    /**
+     * Returns true if either stdout or stderr contains the given string
+     */
+    public boolean contains(String expectedString) {
+        return stdoutContains(expectedString) || stderrContains(expectedString);
+    }
+
     /**
      * Verify that the stdout and stderr contents of output buffer contains the string
      *