Added macro for including the GLES2 header.

include/GL/glfw3.h

@@ -161,6 +161,8 @@ extern "C" {
 #else
   #if defined(GLFW_INCLUDE_GL3)
     #include <GL3/gl3.h>
+  #elif defined(GLFW_INCLUDE_ES2)
+    #include <GLES2/gl2.h>
   #else
     #include <GL/gl.h>
   #endif

readme.html

@@ -284,6 +284,7 @@ version of GLFW.</p>
   <li>Added <code>GLFW_OPENGL_ROBUSTNESS</code> window hint and associated strategy tokens for <code>GL_ARB_robustness</code> support</li>
   <li>Added <code>GLFW_OPENGL_REVISION</code> window parameter to make up for removal of <code>glfwGetGLVersion</code></li>
   <li>Added <code>GLFW_INCLUDE_GL3</code> macro for telling the GLFW header to include <code>gl3.h</code> header instead of <code>gl.h</code></li>
+  <li>Added <code>GLFW_INCLUDE_ES2</code> macro for telling the GLFW header to include the OpenGL ES 2.0 header instead of <code>gl.h</code></li>
   <li>Added <code>windows</code> simple multi-window test program</li>
   <li>Added <code>sharing</code> simple OpenGL object sharing test program</li>
   <li>Added <code>modes</code> video mode enumeration and setting test program</li>