remove dependency of EGL on ndk header

Change-Id: Ia6e489b5b4f028864bdf54923e81f604710dd8ad
diff --git a/opengl/include/EGL/eglplatform.h b/opengl/include/EGL/eglplatform.h
index bfac71b..af4d11f 100644
--- a/opengl/include/EGL/eglplatform.h
+++ b/opengl/include/EGL/eglplatform.h
@@ -80,8 +80,7 @@
 
 #elif defined(__ANDROID__) || defined(ANDROID)
 
-#include <android/native_window.h>
-
+struct ANativeWindow;
 struct egl_native_pixmap_t;
 
 typedef struct ANativeWindow*           EGLNativeWindowType;