Some fixes

The current code has a debug Warning from WordPress by the way jquery is being enqueued. I’ve modified the code for the warning to go away, to include https links and to fix a syntax error on the get_bloginfo line:

function make_me_links_js() {
  wp_enqueue_script('jquery');
  echo '<script>
  jQuery(document).ready(function(){
		jQuery(".entry-content a[href^=\'http://\']").attr("target","_blank");
		jQuery(".entry-content a[href^=\'https://\']").attr("target","_blank");
		jQuery(".entry-content a[href^=\'' . get_bloginfo("url") . '\']").attr("target","_self");
	});
	</script>';
}

https://wordpress.org/plugins/make-me-links/