Remove Query Strings from static resources

In order to achieve that result, I added this code to functions.php

function _remove_script_version( $src ){
	$parts = explode( '?', $src );
	return $parts[0];
}
add_filter( 'script_loader_src', '_remove_script_version', 15, 1 );
add_filter( 'style_loader_src', '_remove_script_version', 15, 1 );

this lines works like a charm, but actually I need this couple of css files (from GD Star Ratings plugin) to be untouched:

/wp-content/plugins/gd-star-rating/css/gdsr.css?ver=1.9.20
/wp-content/gd-star-rating/css/rating.css?ver=1.9.20

Any idea about how to set a filter to exclude a particular css/js file from the above script code?

Thanks in advance for the help.