This change makes the `update_appup.escript` check whether the new
version of an application (the _current_ one) is already contained in
entries in the _new_ .appup file for that application if such .appup
file contains regexes.
NOTE: this does not cover the case in which we calculate the
difference between _old_ and _new_ appup entries, and those consist of
regexes. In such case, we would need to check if one regex is
"contained" in the other, which is not currently supported by this
patch.
3ff6661a58