Anatol Pomozov authored Mar 15, 2021 and Allan McRae committed Mar 25, 2021

Total download callback called right before packages start downloaded.
But we already have an event for such event (ALPM_EVENT_PKG_RETRIEVE_START)
and it is naturally to use the event to pass information about expected
download size.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>