Use plain glamor_egl_create_textured_screen().

Since 5064ffab631 (2014), glamor's implementation of _ext just drops the
back_pixmap arg, which we were passing NULL (the default) to anyway.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
(Ported from radeon commit 2b7d77b90108911777a11ecaa63435552000c958)

src/amdgpu_glamor.c

@@ -66,10 +66,9 @@ Bool amdgpu_glamor_create_screen_resources(ScreenPtr screen)
 #endif
 
 	if (!amdgpu_bo_get_handle(info->front_buffer, &bo_handle) ||
-	    !glamor_egl_create_textured_screen_ext(screen,
-						   bo_handle,
-						   scrn->displayWidth *
-						   info->pixel_bytes, NULL)) {
+	    !glamor_egl_create_textured_screen(screen, bo_handle,
+					       scrn->displayWidth *
+					       info->pixel_bytes)) {
 		return FALSE;
 	}