Made method static

Signed-off-by: Emmanuel Bigeon <emmanuel@bigeon.fr>

gclc.system/src/main/java/net/bigeon/gclc/system/ForwardingRunnable.java

@@ -87,7 +87,7 @@ public final class ForwardingRunnable implements Runnable {
      * @param is the input stream
      * @throws CommandRunException if the manager was closed while writing the
      *         stream */
-    private void readToEnd(final ConsoleOutput out, final InputStream is)
+    private static void readToEnd(final ConsoleOutput out, final InputStream is)
             throws CommandRunException {
         int c;
         try {