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Apparently, there's no way to remove one plugin from the Must-Use list...

But then, found a filter that does even better:
show_advanced_plugins will completely hide the sight of the Must-Use plugins.

After all, if you're trying to hide something of this nature, then hide it all...

It's inside the class WP_Plugins_List_Table and takes two arguments: a boolean and the plugin type (mustuse and dropins).

Check this article for a reference of MU and specially Drop-ins. But, for the sake of the wiki, I'll post the DI table at the end of this answer.

The Drop-in plugin

For testing this procedure we need one of those. Create a file named db.php at the root of your wp-content folder and copy this:

<?php
/*
    Plugin Name: Just for testing Drop-ins
    Version: 0.1
    Author: WPSE
    Author URI: http://wordpress.stackexchange.com/
*/

The Must-use plugin

Then, this one inside the mu-plugins folder, and set the parameters of the class.

<?php
/*
Plugin Name: Hide Must-Use and Drop-ins from the Plugins listing
Plugin URI: http://wordpress.stackexchange.com/a/
Description: Used to hide the Must-Use and Drop-ins plugins from all users except one. Also can hide a selected plugin from the regular list, be it active or not.
Version: 1.0
Author: WordPress-StackExchange
*/

/**
 * Parameters of the class
 *
 * @super_admin     : string  (required)    : the user which is able to see everything
 * @can_see_mustuse : boolean (required)    : can other users see the Must-Use list?
 * @can_see_dropins : boolean (required)    : can other users see the Drop-ins list?
 * @hide_this_one   : string  (optional)    : plugin to hide in the regular listing
 *
 * Reference article for Must-Use and Drop-ins
 * http://hakre.wordpress.com/2010/05/01/must-use-and-drop-ins-plugins/
 */

class Wpse00000_HideAdvancedPlugins
{
    public function __construct($data)
    {       
        $this->user     = $data['super_admin'];
        $this->mustuse = $data['can_see_mustuse'];
        $this->dropins = $data['can_see_dropins'];
        $this->hide     = isset($data['hide_this_one']) ? $data['hide_this_one'] : false;
        
        if($this->hide)
            add_filter('all_plugins', array(&$this, 'on_list_plugins') );
        
        add_filter('show_advanced_plugins', array(&$this, 'on_list_advanced'), 10, 2 );
    }
        
    public function on_list_plugins($plugins)
    {
            global $current_user;

            if( $this->user != $current_user->user_login ) 
                unset($plugins[$this->hide]);

           return $plugins;
    }
    
    public function on_list_advanced($show, $type)
    {
            global $current_user;
    
            if( $this->user != $current_user->user_login ) 
            {
                if( 'mustuse' == $type ) 
                    return $this->mustuse;

                if( 'dropins' == $type ) 
                    return $this->dropins;
            }

           return true;
    }
}

$wpse00000_HideAdvancedPlugins_instance = new Wpse00000_HideAdvancedPlugins(
    array(
        'super_admin'       => 'the_user_login',
        'can_see_mustuse'   => false,
        'can_see_dropins'   => false,
        'hide_this_one'     => 'akismet/akismet.php'
    )
);

Reference

by hakre on wordpress