Fix ConnectionStreamFactory with javac

Author: snjeza

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/ConnectionStreamFactory.java

@@ -40,7 +40,7 @@
  */
 public class ConnectionStreamFactory {
 
-	interface StreamProvider {
+	protected interface StreamProvider {
 		InputStream getInputStream() throws IOException;
 
 		OutputStream getOutputStream() throws IOException;