gl-renderer: remove print_egl_error_state

Nothing uses this, but the implementing function is used by gl-renderer
internally.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/renderer-gl/gl-renderer.c

@@ -4117,5 +4117,4 @@ WL_EXPORT struct gl_renderer_interface gl_renderer_interface = {
 	.output_destroy = gl_renderer_output_destroy,
 	.output_set_border = gl_renderer_output_set_border,
 	.create_fence_fd = gl_renderer_create_fence_fd,
-	.print_egl_error_state = gl_renderer_print_egl_error_state
 };

libweston/renderer-gl/gl-renderer.h

@@ -114,7 +114,4 @@ struct gl_renderer_interface {
 	 * EGL_ANDROID_native_fence_sync extension.
 	 */
 	int (*create_fence_fd)(struct weston_output *output);
-
-	void (*print_egl_error_state)(void);
 };
-