scripts/download.pl: Use CDN for kernel downloads

More info at https://www.kernel.org/introducing-fastly-cdn.html

Signed-off-by: Petr Štetiar <ynezz@true.cz>

scripts/download.pl

@@ -207,8 +207,8 @@ foreach my $mirror (@ARGV) {
 			push @extra, "$extra[0]/longterm/v$1";
 		}		
 		foreach my $dir (@extra) {
-			push @mirrors, "https://kernel.org/pub/$dir";
-			push @mirrors, "ftp://kernel.org/pub/$dir";
+			push @mirrors, "https://cdn.kernel.org/pub/$dir";
+			push @mirrors, "https://www.kernel.org/pub/$dir";
 		}
     } elsif ($mirror =~ /^\@GNOME\/(.+)$/) {
 		push @mirrors, "http://ftp.gnome.org/pub/GNOME/sources/$1";