Correct GLES3 extension header paths

include/GLFW/glfw3.h

@@ -150,12 +150,12 @@ extern "C" {
  #elif defined(GLFW_INCLUDE_ES3)
   #include <GLES3/gl3.h>
   #if defined(GLFW_INCLUDE_GLEXT)
-   #include <GLES3/gl2ext.h>
+   #include <GLES2/gl2ext.h>
   #endif
  #elif defined(GLFW_INCLUDE_ES31)
   #include <GLES3/gl31.h>
   #if defined(GLFW_INCLUDE_GLEXT)
-   #include <GLES3/gl2ext.h>
+   #include <GLES2/gl2ext.h>
   #endif
  #elif !defined(GLFW_INCLUDE_NONE)
   #include <GL/gl.h>