build-filesystem-ng processes -p package before basefs

[tormodvolden]

The documentation says that it is "luck" that basefs is processed first, but unluckily the -p package gets processed first if it is in the same folder (inode order?). This breaks if my -p package uses /dev or /bin folders - it will have to create these folders and then basefs will fail. A workaround is to make build-filesystem-ng allow multiple (or rather duplicate) defines of folders (patch available).

This issue is part of what is explained under "Futures" in Documentation/build-filesystem-ng.md but it might be worth tracking it here.