copy-tarballs.pl: Create base-32 symlinks

maintainers/scripts/copy-tarballs.pl

···
 
     my $sha256 = hashFile("sha256", 0, $storePath) or die;
     symlink("../$fn", "$tarballsCache/sha256/$sha256");
+
+    $sha256 = hashFile("sha256", 1, $storePath) or die;
+    symlink("../$fn", "$tarballsCache/sha256/$sha256");
 }