File _service of Package cgal

<services>
	<service name="download_url">
	    <param name="host">github.com</param>
	    <param name="protocol">https</param>
	    <param name="path">/CGAL/cgal/releases/download/v5.2/CGAL-5.2.tar.xz</param>
	</service>
	<service name="verify_file">
		<param name="file">_service:download_url:CGAL-5.2.tar.xz</param>
	   	<param name="verifier">md5</param>
	   	<param name="checksum">7c764809767f8a49815856b94d81f3bd</param>
	</service>
</services>