Revert "Revert "httrack: use stable download URL""

This reverts commit dc5728470832ac1e65894d524da9ccb9cd2a5eee.
Revert "Revert "Revert "httrack: use stable download URL"""

This reverts commit eb7b7ee1997c056a6a233c26be053826f7e52530.
Revert "Revert "Revert "Revert "httrack: use stable download URL""""

This reverts commit 8192d63939fc9b988d62d985d168662d7100bf5f.