Examples: OpenGL2 example doesn't need Glew

examples/opengl_example/main.cpp

@@ -10,9 +10,7 @@
 #include "../../imgui.h"
 #include <stdio.h>
 
-// Glfw/Glew
-#define GLEW_STATIC
-#include <GL/glew.h>
+// Glfw
 #include <GLFW/glfw3.h>
 #define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT))
 
@@ -141,8 +139,6 @@ void InitGL()
     glfwSetMouseButtonCallback(window, glfw_mouse_button_callback);
     glfwSetScrollCallback(window, glfw_scroll_callback);
     glfwSetCharCallback(window, glfw_char_callback);
-
-    glewInit();
 }
 
 void LoadFontsTexture()