[scanner] Deep copy json structs (Closes: #985)
[scanner] Deep copy json structs (Closes: #985)

The lists in the DEFAULT_JSON_PER_BUILD where only initialized and thus
shared between builds resulting in accumulating the entries over all
versions. As per 2f5d780c4 DEFAULT_JSON_PER_BUILD is used as an API, so
use deepcopy to work around it.

f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver