vout_ios: Don't include ES1 headers

This vout uses ES2, not ES1. The right headers are included by
opengl.h anyway, this was just confusing and wrong.
Signed-off-by: Martin Storsjö <martin@martin.st>

modules/video_output/ios.m

@@ -27,8 +27,6 @@
  *****************************************************************************/
 
 #import <UIKit/UIKit.h>
-#import <OpenGLES/ES1/gl.h>
-#import <OpenGLES/ES1/glext.h>
 #import <QuartzCore/QuartzCore.h>
 #import <dlfcn.h>