How to remove RSS feeds from Wordpress theme

I never used the theme “Opulus Sombre”. But the feed link on the <head> section typically comes from the functions.php. There is a line saying¹:

add_theme_support( 'automatic-feed-links'  );

Otherwise it can be hard-coded to your header.php like²:

<link rel="alternate" type="application/rss+xml" title="https://wordpress.stackexchange.com/questions/122841/<?php bloginfo("name'); ?> RSS Feed" href="https://wordpress.stackexchange.com/questions/122841/<?php bloginfo("rss2_url'); ?>" />

_{1. Codex: Automatic Feed Links

2. WordPress 3.0 Theme Tip Feed Links — ottopress.com}

EDIT

Thanks to Chip Bennett for the actual answer, just putting that into the answer with full respect to him:
Just use the following code into your functions.php to remove feed link:

add_action( 'after_theme_support', 'wpse_122841_remove_feed' );

function wpse_122841_remove_feed() {
   remove_theme_support( 'automatic-feed-links' );
}

Thanks to Chip Bennett for the addition. Thanks birgire and Vincent for suggesting the fixes.

EDIT

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