izpack/izpack — pull request #98 by Murdock01 (2013-03-12 19:55:37+00:00)
Title: fix for adding multiple archives with same folders

when adding different (zip)archives with same folders, but different os constraints, an error is thrown.
example:

in booth archives are the same folders and files, but for different operating systems.

during adding of the second zip, mkdirs() returns false, because the folder exists.