function filter( list ) {
	var out;
	var i;
	out = [];
	for ( i = 0; i < list.length; i++ ) {
		if ( indexOf( builtins, list[ i ] ) === -1 ) {
			out.push( list[ i ] );
		}
	}
	return out;
}
Removes strings which match a built-in module name.

@private
@param {StringArray} list - list of strings
@returns {(StringArray|EmptyArray)} filtered list