portdbapi.getfetchsizes: use .__download__ suffix

If the file does not exist locally or the size is not correct,
use the file with the .__download__ suffix to compute the
remaining_size to fetch.

Fixes: ebbde237d33e ("fetch: atomic downloads (bug 175612)")
Bug: https://bugs.gentoo.org/688124
Signed-off-by: Zac Medico <zmedico@gentoo.org>
1 file changed