Comment 7 for bug 1073390

It succeeded on amd64, but failed on i386:

https://jenkins.qa.ubuntu.com/view/Raring/view/AutoPkgTest/job/raring-proposed-adt-libarchive/lastFailedBuild/

on i386 it gets a few errors on stderr:

examples/minitar/minitar.c: In function ‘copy_data’:
examples/minitar/minitar.c:406:3: warning: passing argument 4 of ‘archive_read_data_block’ from incompatible pointer type [enabled by default]
In file included from examples/minitar/minitar.c:45:0:
/usr/include/archive.h:420:15: note: expected ‘int64_t *’ but argument is of type ‘off_t *’
examples/untar.c: In function ‘copy_data’:
examples/untar.c:210:3: warning: passing argument 4 of ‘archive_read_data_block’ from incompatible pointer type [enabled by default]
In file included from examples/untar.c:60:0:
/usr/include/archive.h:420:15: note: expected ‘int64_t *’ but argument is of type ‘off_t *’

This looks like it could cause actual issues. Benjamin, do you want to look into this, or should we just ignore stderr in the tests?