Use Fetch::LWP specifically for gzip encoded response

Because the current SWI-Prolog web server only responds with
"Content-Encoding: gzip" even when trying to request with
"Accept-Encoding: identity". The server will not work with HTTP::Tiny.

alienfile

@@ -128,6 +128,7 @@ share {
 	# https://www.swi-prolog.org/download/stable/src/
 	# https://www.swi-prolog.org/download/devel/src/
 	start_url "https://www.swi-prolog.org/download/$release_type/src/";
+	plugin 'Fetch::LWP';
 	plugin Download => (
 		version => qr/swipl-([\d\.]+)\.tar\.gz/,
 	);