Made VBOTracker and StateStack package private

src/java/org/lwjgl/opengl/StateStack.java

@@ -32,7 +32,7 @@
 
 package org.lwjgl.opengl;
 
-public class StateStack {
+class StateStack {
 	/** Only int state is tracked */
 	private final int[] state_stack;
 	private int stack_pos;

src/java/org/lwjgl/opengl/VBOTracker.java

@@ -32,7 +32,7 @@
 
 package org.lwjgl.opengl;
 
-public class VBOTracker {
+class VBOTracker {
 	private static VBOTracker default_tracker = new VBOTracker();
 	private static VBOTracker current_tracker = default_tracker;