external dependencies [5.0]
Same as #6307 .
Currently, the update_appup.escript outputs as an error the full appup
file for external dependencies, even if all the changes are already
contained in the depency. Here, we make it only output the missing
actions to be inserted, to aid in seeing what are the differences.
- Fixes clause error on `create_stub/1`.
- Small optimization: do not download the same file multiple times
with `wget`.
- Fix: remove old file extension (`.app.src`) and preserve dirname
when creating stubs for apps.
Thales Macedo Garitezi