do not suggest org.jruby.util.ShellLauncher.ChannelPumper when find usages of "Thread.start"

java/java-tests/testData/codeInsight/gotosuper/OverridingLibrary.java

@@ -0,0 +1,9 @@
+
+interface Pumper extends Runnable {
+    void start();
+
+}
+
+class MyThread extends Thread implements Pumper {
+
+}