lib: Ignore a warning about a deprecated libarchive function
lib: Ignore a warning about a deprecated libarchive function

archive_read_finish() is deprecated in favour of archive_read_free() in
libarchive version 3.0; but was not deprecated in version 2.0, which we
need to continue to support.

See http://manpages.org/archive_read_finish/3

https://bugzilla.gnome.org/show_bug.cgi?id=776323

GNOME/libgxps,GNOME/libgxps,GNOME/libgxps