If for some reason you still need to use it, it is still possible, just add the following line to your functions.php file.
For example. In one of my client website we use it for some packs game links in an online shop at the top of the website. We build it this way because we could use categories, images, etc… instead of using a menu item. However when I update wordpress to the last version I needed to keep this functionality.
Put back Links menu blogroll in Worpdress
Add this line in your code:
add_filter( 'pre_option_link_manager_enabled', '__return_true' );
If this functionality has been removed from wordpress there is some reasons.
I recommend this article to know more about blogroll http://www.probloggertips.com/dont-blogroll